They basically need to get lucky again in the draft to get a # 2 or attach a bunch of assets to get rid of bad contracts, neither option is favorable. (sbnation.com)
Good vs. Bad Contract: Most successful agents have author / agent agreements that look (for the most part) the same. (literary-agents.com)
BUT: not all bad contracts come from vanity publishers and overt scammers. (annerallen.com)