Completely irrelevant comparison, and a bit of a stretch.
What else ya got?
Nope, same fucking thing.
'I paid $300 for this sponsor membership and didn't sell anything, therefor you owe me.'
No, you paid for a fucking service, just because you didn't use it doesn't mean you're entitled to jack.
As for not being able to PM anybody, you need to get off the rock. Non-paying members can PM anyone they want. The only thing advantage you get for paying for a membership in the area of private messages here is more PM storage.