Sooo..

[Daniel]

post limit will increase spam posts

[SJshah]

Pff, I've always had leechers. People making 10 accounts per toss is my problem. They even make multiple emails to win MU Platinum accounts and such.

i'm pretty sure theres a vb mod that allows only 1 account per ip.
it will not let you create another account if the ip address has been assigned to an account.

a post limit would work, but you'll need active mod's to ban spammers.

[Royal King]

There is an modification in vB, Multiple account detection. Install that. Once some of your member trips it (by Ip or cookie) they will automatically be moved to banned members ;D