This isn’t any answer to your questions but I offer this advice anyway.
considering the recent shut-down of NETeller for US players (80% the market) … I’d not be in any hurry to invest a lot of time and money towards a niche that seriously is looking at some troublesome times ahead before they get better.
I’m sure there are those who will disagree. And I’d not have said this before yesterday but I truly believe there’s going to be some very rough roads ahead before they smooth out … if ever.
Not trying to run you out because I’m afraid of competition, just trying to perhaps save you a lot of disappointment if you’re seeking any kind of near-future rewards.
Just my 2 cents.