For book/ebook authors, publishers, & self-publishers
I just became a co-agent on a project. I don’t know if agents often invite clients to share in commissions when they bring good stuff to them, but mine did. I didn’t refuse the offer. The whole story of how I became a co-agent is worth reading on www.publishersmarketplace.com/members/billstephens
This is a source of revenue agented writers might be overlooking.