Hi Professor,
Being a sportsbook affiliate is a slightly different ball game than a casino affiliate but the earning potentials are equally as high, if not higher. After trying out both the sportsbook affiliate biz, and during the past six months focusing on the casino affiliate biz I found it easier overall bringing in sportsbook players.
You will notice on the sportsbook side it is a select few affiliates who account for the majority of the players and they do it by having sports betting content specific websites, alongside by understanding the sport they are promoting.
Sadly in the past several less reputable sportsbooks ripped off affiliates and this put affiliates off promoting sportsbooks. Don’t be put off promoting sportsbooks as this is largly an untapped market.
For a recent example or a sports betting portal I worked on please take a look at http://www.nfl-2004-schedule.com , and you will get an idea of what makes a good sportsbook portal.
Also note cost per acquisition of a sportsbook player is a lot higher, but they tend to stay longer and gamble more at a sportsbook over a casino (on average the player retention and quality is higher than casinos).
I hope this is of some help, and look forward to seeing more affiliates promoting sportsbooks in the future.
Feel free to PM me at anytime.