[fatass748]

IMO this is the toughest market to get into. It is by far the most competitive anyway. The sky is the limit though. I'm still making money off of ads I posted over a year ago.
Making and mangaing the sites isn't hard to do. You can easily set up 10 free gallery posts and have a script(purchased for 100-200ish) do all the work. The tough part is getting the traffic. Setting up trades with other sites, posting on every link dump you can find. It all comes down to how much work you will do. $0 profit is common but so is 1-2k.

Then there's the sites with exclusive content. The ones that do really well. They do the filming while the sites above do the advertising for them. The problem is they are all getting sued now. cohf.com which made ~3M a year has just been sued for 1 billion for prostitution and filming indecent content in Miami. Bangbros and the cumfiesta network are being targeted as well.

Congrats on your success