This is a very smart thing to do. Sponsors that do not do things like this are setting themselves up for future failure. Every sponsor needs a site like this to secure their own source of traffic and bookmarkers. Great job guys.
Something you may want to consider is doing a trade/affiliate scheme. Let trades send to your site with thier affiliate id imbedded and credit them signups on your site, ie a trade can send to you via
http://wastelandtgp.com&aff=affililiateidhere and any signups his traffic produces on your galleries he gets credit for.