Link on your site advertising Ventrilo Servers

I want to put a link on your site / forum / whatever that links to my web site. Your site has to be related to people who would use Ventrilo (ie: gaming, WoW, etc)

I am an official Ventrilo host, so I get a lot of hits directly from there but I'd like to expand my business a bit more. I've tried google ads and yahoo ads and I seriously haven't got a single sign-up from these even with aggressive advertising. I get new sign-ups all the time just by being listed in the ventrilo.com web site..