Based on this competition [1] it seems that their business model is different subscription packages. The Gold package, for example, is supposedly $588 per year.

Based on this competition [1] it seems that their business model is different subscription packages. The Gold package, for example, is supposedly $588 per year. [1] http://thinkvitamin.com/asides/guess-this-badge-and-win-a-free-one-year-gold-treehouse-account-588-value/ http://thinkvitamin.com/asides/guess-this-badge-and-win-a-fr...