If people are participating across the Stack Exchange network and have reached 200 reputation in total, they probably have gotten to a point where they know a little bit about how to use SE.
Example reason 1: Why reputation stacking for the 200-threshold could be a good thing?
I have a question on superuser that I couldn't provide an image/diagram for to aid understanding, and as a result attracted attention I was expecting about something different from the question. "I bet somebody will think..." is what motivated me to provide an image that I was prevented from embedding.
Example reason 2:
I don't know enough to answer questions, I sometimes know enough to write a unique question, but I definitely know enough to know that was the correct answer, but I can't positively contribute by voting up a helpful answer, asking for clarification, or pointing out the answer is close but [not the direction solution, which btw I discovered was XYZ].
Does anyone else think stacking reputations for unique content could improve SE?
Unique content: To be specific, I do not believe ALL reputation should stack-- certain reputations are redundant
Accepted an answer
Asked a question that got voted up once
Myself: I might know enough stuff about everything to be able to contribute in some ways like adding comments or asking for clarification, but I shouldn't necessarily be allowed to answer questions.
Edit: this appears to already be under discussion here
(I wish I could vote it up, comment that I agree, or upvote @DarkSheep's comment about "finite implementation details")!!!