There will always be the questionable opportunists among us.... nothing we can do to change that.
The people who see the system in a whole different perspective. Shame they had to go along and do that.
I'd suggest to disable new accounts from the same IP address, but that won't work because an IP address is easily changed, and almost everyone these days has a dynamic ip address, plus some members might be in the same household.
At this point, to stop the questionable opportunists, the best we could is disable new accounts and make it a members-only thing.
I salute you Theory11, this was a really great and bawlsy promotion to do!