I've said before that it feels like a lot of escorts have read some guide about what you're supposed to do because I've experienced the goodbye kiss repeatedly (sometimes even a hug+ a kiss) with a number of different escorts.
I honestly don't remember how I found the forum. It was probably through googling an escort and seeing a thread from here in the search results.
The forum slowly grows by hobbyists coming across it in one form or another. I don't know how you'd pursue an aggressive growth strategy, or why for that matter. The last thing you want is to attract the attention of the feds and have the site shut down like backpage and rentboy.
As I bi man myself I can say that it's way easier to either just be gay or straight. When you're bi you want the traditional wife and kids but you also want to bang dudes on the side.
My personal unscientific view is that the only people into daddies are twinks whose dads rejected them when they came out and are thus misguidedly seeking approval from an older man.