I've played a dozen times and I do not like re-buy game and almost every game is with re-buy. The most player are from USA and a lot of them play LAG and then go for re-buy. A lot of players play on mobile so my opinion is that they take it for fun (I'm talking about small buy-ins that I've played, so I do not know for games for $11 or more.)
If you are good poker player, try to play Double or Nothing Single table, you've got a $1.5 and $3.5, where 5 of the 10 players received double the invested and 5 receives nothing. Very easily you can increase your bankroll. I am a beginner and I had a lot of success in these games.
For cashing out you need to wait about 7 to 14 days, depending on your choice how you want to cash out. The faster way is with credit card but to be sure check on their site what you need of documents. I know that minimum for cashing out is $50.
They have some promotions so if you put some money you can expect to get some "free" money. When I say "free money" I mean free money with condition to spend it on their casino games. I used that "free money" for playing casino Hold'em and I was good the first night, but I lost all the following night
If you make some money in the casino, that money will be cashed into your account and you can use it for poker.
That's all I know.