DAZ 3d has a very similar kind of deal (Platinum Club). I belonged to it for a year, and found that ultimately it was well worth the price ($75/yr. at the time, several years ago). The only reason I haven't done it any longer was simply because once you've accumulated all those discounted assets along with the tons of free ones (very few usable in a game without modification, high polys etc.), there is very little left, and new material was added quite infrequently to the club. Good deal, though, and I don't regret it! I think it's a great idea. Another source of revenue, for sure!
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics