Again, you do not have to take these deals at face value nor take them at all. Negotiate for a better position before you sign and if that fails, then do not sign. I would say the same thing for someone breaking in to the business but Dave came in with a successful comedy special and movie appearances. If networks did not want to give him what he felt he deserved then he should not of taken the deal, grind even more, and come back. Most likely you will not be pitching your idea to the same people anyways and if you are, then you will have more leverage to get a better deal.
This should be a cautionary tale to those who want money and fame and feel they need to fukk themselves to get ahead. Is it better to be potentially famous and own nothing, or to own everything and run the risk of not being a big star?