I would say that 'plausible' is relative and greatly influenced by the results the OP experienced when applying any given answer to a question. There are some factors that make a correct, not just plausible answer gather dust:
- The answer suggested to the OP that their language of choice simply can not effectively solve the problem. The OP does not know the suggested language.
- The answer was correct in the context of the question, however incorrect when actually applied to the problem. This usually means the OP did not provide enough background / context when asking the question. For instance, it may fix the problem at hand, but break something else that is completely unrelated.
- The answer involves more work than the OP is able or willing to do.
- The question is highly subjective and every answer is correct, the OP is unable to single out the 'best effort'.
I sometimes answer bounty questions because I like the thrill of winning a prize, just like I enjoy throwing darts at balloons at carnivals. The prize itself (in this case rep) is incidental, just like the cheap stuffed animal.
I usually put quite a bit of time and effort into my answers, I too become slightly annoyed when there is absolutely no feedback or answer chosen. I always wonder "Did this person take my example and get his pay check, without even bothering to give me my puny prize?"
Then again, I try very hard to assume the best in people.