I have some questions about the winners of Codechef and other online programming competitions.

general
1

How much is their average income (per hour)?
In what kind of projects usually do they participate?
Do employers usually look for them to hire them, or winners usually look for job?
Are there a lot of projects for them or not?

2

I’d say, that Quora is a good place to ask such questions…

For example this one might help you.