It appears to be a pretty flexible requirement. I'm sure if you walked up with cash in hand for the program w/o two years of collete, they would welcome you anyways.
The rule is in place so they have an idea that you can handle a stressful workload.
When I visited ATP, Manassas, they were very good about reiterating the high price and that you should make sure you can handle the price and the workload, that it's not a decision to take lightly.