I don't have the greatest references available, but a naive Google search brings up quite a few sources from databases and surveys that say that while 30% of poker players do better than break even, only 18% of actually manage to make any kind of worthwhile income from poker and only 5% of poker players make what is considered good income from it.

I don't know what "good income" is, whether it's like 100k a year or 500k a year... but I can take a pretty good guess that unless you're in the top 15%, poker is probably not worth it professionally.