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Just my two cents.

Consider Stack Overflow, which is quite the oldest. It hosts questions about a ton of different programming languages. An expert on one language may not know much about another language, but the site works well. People can sort or filter questions based on different tags for different languages.

Consider English Language and Usage. Some choose to involve only in grammar, pronunciation etc. while most only on word-requests, idiom-requests, etc.

Perhaps the users who know about a currency might know a little about others as well, not all, but some users.

  If we were to have a unified site for such currencies, and individual tags to help sort and filter them, maybe the site would be very active, instead of a dozen less-active ones which split the audience. Even if some currencies rise and fall, their questions will all have a place to stay.

Again, I don't know anything about those currencies. So I may be blatantly incorrect in assuming this.

Just my two cents.

Consider Stack Overflow, which is quite the oldest. It hosts questions about a ton of different programming languages. An expert on one language may not know much about another language, but the site works well. People can sort or filter questions based on different tags for different languages.

Consider English Language and Usage. Some choose to involve only in grammar, pronunciation etc. while most only on word-requests, idiom-requests, etc.

Perhaps the users who know about a currency might know a little about others as well. If we were to have a unified site for such currencies, and individual tags to help sort and filter them, maybe the site would be very active, instead of a dozen less-active ones which split the audience. Even if some currencies rise and fall, their questions will all have a place to stay.

Again, I don't know anything about those currencies. So I may be blatantly incorrect in assuming this.

Just my two cents.

Consider Stack Overflow. It's quite the oldest and not a perfect analogy but still. It has questions about a ton of different programming languages. An expert on one language may not know much about another language, but the site works okay as it is. People can sort or filter questions based on different tags for different languages.

Consider English Language and Usage. Some choose to involve only in grammar, pronunciation etc. while most only on word-requests, idiom-requests, etc.

Perhaps the users who know about a currency might know a little about others as well, not all, but some users.

If we were to have a unified site for such currencies, and individual tags to help sort and filter them, maybe the site would be very active, instead of a dozen less-active ones which split the audience.

Again, I don't know anything about those currencies. So I may be blatantly incorrect in assuming this.

Just my two cents.

Consider Stack Overflow, which is quite the oldest. It hosts questions about a ton of different programming languages. An expert on one language may not know much about another language, but the site works well. People can sort or filter questions based on different tags for different languages.

Consider English Language and Usage. Some choose to involve only in grammar, pronunciation etc. while most only on word-requests, idiom-requests, etc.

Perhaps the users who know about a currency might know a little about others as well, not all, but some users.

If we were to have a unified site for such currencies, and individual tags to help sort and filter them, maybe the site would be very active, instead of a dozen less-active ones which split the audience. Even if some currencies rise and fall, their questions will all have a place to stay.

Again, I don't know anything about those currencies. So I may be blatantly incorrect in assuming this.

Just my two cents.

Perhaps users who know about a currency might know a little about others as well, not all, but some users.

If we were to have a unified site for such currencies, and individual tags for those, maybe the site would be very active, instead of a dozen less-active ones.

Examples I can think of are SO with a bunch of different programming languages, ELU with a group of experts under various tags - grammar, pronunciation, etc. If we were to keep separate sites for those, I don't think those sites would have survived long.

Again, I don't know anything about those currencies. So I may be blatantly incorrect in assuming this.

Just my two cents.

Consider Stack Overflow. It's quite the oldest and not a perfect analogy but still. It has questions about a ton of different programming languages. An expert on one language may not know much about another language, but the site works okay as it is. People can sort or filter questions based on different tags for different languages.

Consider English Language and Usage. Some choose to involve only in grammar, pronunciation etc. while most only on word-requests, idiom-requests, etc.

Perhaps the users who know about a currency might know a little about others as well, not all, but some users.

If we were to have a unified site for such currencies, and individual tags to help sort and filter them, maybe the site would be very active, instead of a dozen less-active ones which split the audience.

Again, I don't know anything about those currencies. So I may be blatantly incorrect in assuming this.