"Why would someone swap one good idea for ten bad idea?" This is answered in the FAQ. You get 4 from the top rated ones. Chances are if you haven't worked on your idea by now, you probably won't do it at all. Share your idea and you might get one or more that you will work on. Even if you don't get an idea you think it's "good" you might get inspiration from them or put a twist on these.
"What do you plan to do with "all" the ideas?" Same as everyone else who submits an idea: get inspiration.
"Would you post answer to your own questions for your own site?" I don't understand the purpose of your question.
What's the problem?
What's the solution?
Why would anyone pay for that?
How would you reach your audience?
Are there other solutions out there?
How is your solution any different?
Negative? I am only reflecting the questions back at the post/site that they're asking themselves.
"He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me."
Why would someone swap one good idea for ten bad idea?
What do you plan to do with "all" the ideas?
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Would you post answer to your own questions for your own site? Those being:
What's the problem?
What's the solution?
Why would anyone pay for that?
How would you reach your audience?
Are there other solutions out there?
How is your solution any different?
Will you reject bad ideas?