What's the best way of generating traffic into a free membership site?
 

Quick Site Overview: Users will submit their email address and chosen password in order to gain access to a database of hosted galleries.

As the site requires membership I would assume that the quality of traffic would need to be higher than if driving traffic to a TGP/MGP.

What is the best way of generating traffic into a free membership site?

If you're looking to buy traffic, go with trafficholder. Buying clicked traffic by niche is the way to go, and their prices are very reasonable. :thumbsup

use a lot of stolen content - seems to work well for scammers lately :)