From my understanding, not beyond a certain fairly low point where you max out.

And even when they do, the rush quickly fades. Hence the "hedonic treadmill": http://en.wikipedia.org/wiki/Hedonic_treadmill

I think the trick here is to work towards many small rewards , not a large one. this way , when the rush from one reward fades , you grab another one.

I'm not talking about major positive events, I'm talking about wealth enabling you to create sustainable conditions.