With Terraria, you bought the game...they didn't have to give you jack shit afterwards. They give you a game...and you play it, and you should be happy.
Whatever they do with the money they earned is none of our damn business. If they want to release it for a broader audience (xbox players), then that's their own business.
Of course I would loved it if they would have used the money instead to make more content for terraria, but I far from expected it. They really don't owe us everything. We gave them money (not a lot), and they gave us a great game...I call that an even deal.