at least the bangbus site is probably way too overused, hence them puting a limit on the amount of webmasters in their program. they'll dilute the market too quickly, people will be sick of seeing it and grow uninterested.
if there's some hints of it and shit, people want to see more... if they feel like they've seen all of it already.. they'll ignore it.
"oh, it's that bangbus site again."
