The Movies and TV shows were the best and seems to be the only niches which worked with CPALead not allowed any more.
Do no other niche does not work well,i mean do no other offers are converted well or they do they have tough measure to convert them in to leads.
Anything type of content that the visitor would be willing to pay to get access too. There's limitless number of options for monetizing. Check the cpalead website they have quite a few suggestions.
If you run CPALead on copyright material website like Movies or TV shows then you will only get 7-8 low paying surveys in your account and CPALead officially don't allow Copyright material in their TOS.
The one you convert well with your audience! But if you start from scratch stick on health, dieats and games...