I agree.
There are lots of ways to post under multiple aliases, and relatively hard to catch.
But when the admins find someone, they should be booted immediately, unless one of the aliases becomes a premium member and then the rest get booted.
If someone shells out money to post they are less likely to break the rules.
If they are already a premium member, then all of the aliases should get booted and the poster has to start over with another alias.
JMHO,
Phil