Ken,
I think some people make money and others will not, it’s like anything in life.
Common sense should tell you that people that are good at this must be making money at it. If not, there wouldnt be any affiliates marketing sports books.
It’s just like email, if you receive a ton of spam for “product x” you can bet that people are making good money with it. The very existance of the marketing should indicate there’s money to be made.
Kevin 11