And here we have a "bored software developer" just soliciting free business ideas and the mere suggestion that he should offer something in return seems to be unpopular.
Have you ever considered that the person who you seek ideas from may have developed the idea over months ... or even years of thinking, unpaid research, trial-and-error, awkward conversations with potential users, constant analysis of other things on the market, etc.?
Perhaps you may consider that from their perspective it would be something like, "Why should I share the insights of months/years of thinking about the problem? What were you doing while I was investing the time to investigate the feasibility?"
And yet the very question of what value the idea giver can expect meets scorn.