That would be similar to a scheme some sales reps pulled off in the eighties. Promise the moon to new clients in exchange for getting 10% of all sales, instead of 10% on what the rep could actually sell himself. I Knew of one sales rep who lived in Atlanta, who made a fortune signing up gullible manufacturers, who fell for the sales representative's pitch. The rep did far more to promote himself than he did to promote any actual product. Once the manufacturers signed, it was expensive to get out of the contract. Basically, what the rep did was run small ads in trade journals for his client's product. Basically the same thing the manufacturers were already doing. That was the extent of the rep's actual product sales promotion. I was employed by a small manufacturer and sent to Atlanta to check the sales rep out. When I learned how his operation actual worked, I reported my findings. The manufacturer told the rep to take a hike.
We may soon see a new crop of agents who will sign up everyone they can in hopes a few of their clients will self publish a financial winner.
As the industry changes so will the language in the contracts. I would recommend having an attorney ( one experienced in intellectual property and publishing rights ) review all contracts before signing.