This is my site! I'm one founder of Favor Company and I'd be very happy to answer your questions.
The whole point of Favor is Return the Favor -feature. Which is about buying comments and supporting the artist. So you do have to pay to comment, but you choose the price and the money goes to the artist. It's a great gesture to do when some artist really has a great (e.g.) comic.
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I'm sorry it smells scammish. We've consulted a law firm and tax authorities and I can assure you, it's not a scam. It's not an magic want either.
You have to have good comics to succeed. Nobody will "Return the Favor" on some half-assed drawing
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A lot of content currently is from Finland, but don't let that bother you. Favor is open for the whole world + it really doesn't matter what others do. You get your own page and if someone else is there, they've at least paid you for it.
Thanks for bringing up Favor.org in this forum! Like I said, I'm more than happy to answer & help & discuss.