600 signups a month from a full time gallery submitter is very doable. You need to have good partner accounts and make 2-3 galleries a day. If the sponsor convert, bingo. Many of those doing this buy gallery spots!
As Linkster said, whatever you do it can make money if you work hard at it and do it daily. Free sites are easier for those starting out as it costs less and is easier to get listed.
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