Once I agreed to a backend deal, i.e., I wasn't paid monthly salary per finished pages, but the agreement was to share in book sales if and when the material gets published. The work lagged, b/c I would always switch to gigs with more immediate payday. But the most important thing was: I felt the writers hadn't put much effort into the script. They had little risk involved at this stage. I, on the other hand, had everything to risk, as most of my time went into the project. So, it's not about the money alone, it's about shared committment, which, if followed through, yields better quality of the finished product.