Steve just nailed it on the head. There ARE free ventrilo servers out there, public ones without passwords, so the lazy kids will join random-ass vent channels to game... but why? I don't get it.. (Mind you, Pyro has been on mumble with us on minecraft pretty much 100% of the time, and Dean's experiencing network issues, if I'm not mistaken..).
I think TD just needs a big fuckin sign saying "GET MUMBLE NOW YOU IDIOTS" along with a link (sort of like the last site had). Shit's amazing, and it's free. It's not like we're losing gamers because of it, I doubt that.