Success is relative.
I have found out that the success of a project is relative to expectations. Some might say that success can be measured in money. This is also true for long term measurements... For short term money is a bad unit for measuring success. Some sales people think that money is the way to create success, which leads to over selling instead of thinking long term success.
I have always thought that sales is the tool, not the goal.. The goal is to deliver something our customers like and would like to have more of. Or put in another way: deliver what the customer expects. The only way to be able to do this is by knowing the customers expectation, and at an early stage adjust them if we can't deliver what they expect.