I mean, if you abolish copyright, you've got six and a half billion people who are just as able to sell your "information" as you are. Perhaps there are some people who could survive on one six billionth of what they're currently earning, but not many.
I see no reason to debate with people so stupid to make claims like that. You're probably one of those people who want to make an artificial scarcity and an artificial market to create money for themselves, and I happen to be someone who prefers freedom. If you can't compete with this freedom then get another job.