If sponsors were smart.... most are, they would make a mock members area that after getting more then 10 hits from different IPs using the same pass, the script would let them into a fake members area, with short tease galleries that loads to a join page. It's easy to set up.
I know people that make tons doing that and turn those cheating assholes into paying customers.
Its great traffic actually, depending on how you look at it and run your program.
