I say go ahead and launch the paysite. Your tour areas and graphics will likely consume more bandwidth then all of your members area traffic. If you're setting up a paysite without an affiliate program and can successfully traffic it your margins will likely be huge. Bandwidth is cheap, very cheap.
Surfer joins for $30 bucks...
Let's say 20% for processing... $6
minus marketing <?>
minus bandwidth bill for your free areas <?>
Even if you only net $10 on the poor bastard after those other expenses (highly unlikely) the chances that he downloads 3-5 gigs/mo is nil... on average.
Brad
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