I can see a major problem with people choosing different mixing depths having to wait for other people to choose that much depth as well... Better to just find one depth and make it the default. I like the OMGWTFBBQ approach...
It'd be something more along the lines of OMGWTFBBQ+EXTRASAUCE, available to everyone. I don't have a problem with finding some way to get heavy users to subsidize the added load on the network, per se, should it become apparent that it's an issue.
As someone pointed out, that's an Evan call though.