I have answered your questions in a previous post:
However, the results vary for everyone, it depends on the site you are advertising as well. If the site you are advertising is cool and makes users stay and by chance, you refer whales who bet a lot, you can receive a lot of referral earnings.
Like I said before, the money you earn depends on who you refer and how the site is set up. Yes I did receive sign ups, but they didn't convert that well, but that may be due to the specific people I referred. Either way, it's a good way to earn more than just with the campaign. Any other specific questions you wish to ask? If I didn't answer your questions, could you please elaborate a bit more?