Players capture digital monsters at varying stages of evolution using currency either earned in the free - to - play game or purchased with real cash. (kotaku.com)
And, we'll assume you'd like to make $ 100 / month in real cash flow. (biggerpockets.com)
Of course, many of those «free» personal trades are anything but, with people selling items for real cash via various unofficial websites. (wccftech.com)