If you had an option for a single payment of $1 to sign up for new members, this wouldn't stop most real people from joining, if you explained it as a validation step. But it would stop all trolls, dupes, etc. because even if they were willing to spend the few bucks, you would have their real name.
When I first signed up as a paid member and you sent a thank you card to my real address/name, it was cool... (Thank you, by the way, it was a very nice gesture).
At that amount it wouldn't help support the DP either, so they would still technically be free members and I would leave them classified as free, unless they signed up under one of the standard options.
Technically, pretty easy to achieve, and it might let you open the doors again.
The Philosophy Of Liberty -
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