I've written about this before, but I'm going to say it again ... please no showdowns like the Finest showdown where the game had six steps and they weren't easy. That really burned me to the point where I really soured on the game after enjoying it so much.
And please take off the buy-ins. They really become an issue, especially early on when you may not have that many stubs.
So you just want them to give cards away?
Log in and get a 99 Diamond. Repeat next day?
Showdowns are winnable. Are they cake; no. But they are winnable. And as for taking away buy-ins; you can make your buy-in back after a few missions.