The ratios depend on where your visitors come from, how targeted they are, what type of promo you use and how good the casino is at converting them. It can vary a lot but your figures sound nice. 
why are there so many landing pages with hot chicks on them? Why are they targeting males when most of the visitors are females?
Because the site owners are mostly male and can’t see beyond their own noses. :tongue:
What does “negative carryover” mean exactly?
When one of your players wins, a percentage of the win is deducted from your earnings. Most places will wipe this clean at the start of the next month, but some carry the negative balance over until the win is absorbed. More often than not the player plays it back in the same month and you are clear, but not always.
You need to read the T&Cs of each program before you sign up so you make sure you pick the best ones for you.