Has SO ever thought of implementing a badge for marking questions as favorite? I do not see a lot of this going on, and the badge count I believe reveals that. There are only around 2500 Favorite Question badges and 300 Stellar Question badges awarded.
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Is this a behavior that we really care to encourage? Favorites are just there for our convenience. Starring stuff just to give badges to other people for receiving our stars doesn't seem that useful. (Compare that to badges that encourage both ends of voting, which is the most direct measure of quality on the sites. Encouraging more voting is highly desirable.)
This could easily be gamed. There are no limits on marking things as favorite, so you could just favorite anything and everything and get the badge immediately.
And what benefit is there to the community? You would get a flood of (potentially meaningless) favoriting, which would in turn give out many badges to the users who posted the questions, but how does this help? Badges that urge people to vote more could also be gamed to some degree, but with more voting going on we can better identify which answers are better than others, which questions are crap, etc. In other words, there is some benefit overall to the community by promoting that activity. I just don't see how badges for "favoriting X things" helps anyone.
To look at it another way, favoriting is really just a way to keep track of things you find helpful, interesting, notable, etc., so that you can navigate back to them later from your profile. It's more something you do for your own benefit, not for the benefit of others, so why is a reward needed?