Not sure I completely understand your question, but a few bits of information that might help.
1) Most affiliate programs are run through 3rd parties that manage a group of casino sites, there probably aren’t large networks like CJ out there with much gambling available due to the grey area of legality in this industry. Affiliate Window does represent a few online gambling sites.
2) Casino affiliate programs do provide plenty of statistics on traffic and conversions.
3) CPA vs. revenue share is a common discussion in these forums, essentially, CPA ends up being unfair for one side or the other and most programs and affiliates prefer revenue share since it is lifetime share of profits (something you won’t find in most other industries).