I can't see what you're proposing working well. Abusers are going to lie. It's trivial to find valid names and addresses with little effort. Tools like spamassasin work because it is hard to send, for example, spam about credit cards without mentioning the words "credit card". If there is no reason to input meaningful data then it's not going to work well. Dealing with false positives may also annoy your valid users.

Any ideas, and/or suggestions would be appreciated.

Depends on what business you're trying to run.

• One way of very quickly cutting down duplicates is to charge for registration.
• Another way is to use some piece of unique data that is hard to duplicate or make up. Credit card numbers come to mind (you don't have to charge them money - just check that it validates with the card company).
• Have a manual process. Have them have to appear in person to pickup login details. Have login details posted to their address.
• Although it is also easy to duplicate, making them give a valid email address is another mechanism that may help cut things down.

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