new users will have bandwidth problems while resteeming and doing anything else as well. this is fact is good as they will not be able to get into a resteeming spree, they will rather resteem select posts.

one more idea may be a limit on the number of resteems per day for all users, some kind of limitations similar to voting power. That can solve a lot of abuse. @lifeaef this may be an answer to your question on abuse.