Fewer and fewer independent gambling sites out there.
To tell the truth though, I understand that someone wants to get something back for his hard work; even if it started out as a hobby.
Unfortunately the internet mentality is that "I will get free info but it is ok to see ads while I'm doing it". They see the bait, but not the hook. This is because most web surfers are not dedicated and knowledgeable about the niche, they just hop from site to site and from area of interest to area of interest, so for example a subscription service without ads is not a viable option.