It's nice to see that they added Bitpay as an option, but i honestly have to ask ; is it worth risking your money for a "random" steam key?
And on top of that there's no proof that would ensure that the keys are indeed random; they could just be a bunch of low value items ..
Most of the time you'll get games you don't want to play. It's a mix of low value items they can pick up during a sale and a few copies of actually good games.