They are definitely not losing any money off that deal. I am not buying 6 games off them a month. I never even bought 6 games in a month off gamehouse or realarcade.
The most I ever got off gamehouse was 5 (and three of them games this month were free). Thanks to the nice and understanding people at gamehouse/real. I got two free funtickets and one coupon code for Five Card Frenzy (a game that I can no longer play that I bought for $9.99 in 2007 on gamehouse because of the change). I got more off Real for one game than they are giving for buying 6.
Bigfish must want your money really bad. Switch to gamehouse.com (I don't think they would ever have a ridiculous promotion like that though). You have to pay full price for games when you are not a member of the bigfish club and that is $19.99 right? It's just a matter of time before all those people that are getting 6 games a month are going to run out of games to get.
You only get one for buying 6?