A job where I can swing that type of contract and have the onus completely on me to prove my worth sounds perfect. The sad reality is that it seems like in my field of work the dependencies on others is enough to make such a move very risky. From my experiences I can imagine a few situations which of results in a "you didn't have a good year" kind of reward even though it wasn't my fault and I truly did the best that anybody could have.

When your work in a job that requires leverage and you have dependencies you need your entire dependency chain to do their job so yours can be judged accurately.