I used to play online poker a lot. Watched a lot of tournaments, of course, but didn't use any statistic tools. Now I understand that it's absolutely necessary to make right decisions.
For me fair games come first. If I can’t trust the casino then even the biggest bonus doesn’t matter, cause it all can just disappear unfair.
Bonuses are cool, they make play more fun, but if I have to pick one I’ll always stick with fairness.