If buying is what you seek PPC search engines might be what you need. Also talk with the guys from sex.com I heared good results from other paysite owners.
I would not go with the average broker to send directly to the paysite. If that's what you want I would create one or more trade sites to filter the traffic and make more of it and filter to my paysite on there.
An affiliate program would also help greatly in attracting more surfers to your site.
Last you might want to read my article on feeders:
http://www.2dxtremenetwork.com/feeders1.html
Hope this helps ya out a bit
