A friend of mine makes a about a grand a day as an affiliate of sites in that niche. Paid on a per lead or on deposit, the latter of which gives a higher yield.
Bottom line: Depends on where you are at int he world, but the lower rung operators are typically heavily rigged. Stick with the major ops using Real Time Gaming as their software. Also, do not entirely trust "review" websites. We are 100% biased towards which operator pays the most and/or on time without shaving leads.
Try some unbiased forums, too, for the best advice, like you did here but more focused towards online gaming in your country.
Good luck
