Does anyone know of a Paid to Sign Up Plugin for WP? So that you could have membership-based PTSU completion? Thanks!
For paid plugins I hear good things about Amember and Wishlist Member. For free plugins there's one called s2member. I can't vouch for how well they work as a friend was playing around with them and I've never used them. Offhand those are the main ones he said he enjoyed working with though.