From their FAQ:
Quote: "We take 30 percent of your game's revenue and we pay for operating costs."
Quote: "We use Visa PlaySpan to provide 84 billing methods in 122 countries. They handle all the money. After financial transaction fees (credit card, mobile, facebook coins, paypal) you get 70 percent, we get 30 percent, and we have to pay all the costs for licenses and servers and bandwidth"
Quote: "We pay for all the operating costs, but beyond the initial testing and launch window for you game if you wish to grow your game or keep your game at a distribution level beyond what our share of the revenue can cover, then you would either need to scale your game back, or cover the costs yourself."
Quote: "We also pay for all 3rd party licensing that the HeroCloud makes use of: FaceGen, FMOD, Granny3D, UMBRA, Speedtree, and a number of others that won't cross any developer's view."
Quote: "Once your game is looking good, we absolutely want to be part of marketing it and getting it out there. After all, we don't make money if you don't make money."
They only ever mention you having to pay hosting if it outgrows what they can manage to cover from their 30%.
Also it's worth remembering this is the same engine that Bioware is using as a base for TOR, and Bethesda Softworks is using for a yet unannounced MMO.
Go banana! | Super Nintendo Chalmers! | When I grow up I'm going to Bovine University!