That you don't have to choose you at the same time you choose ticket location. You can check back to see availibility of each ramp or lot. I mention this because, IMO, the U has overestimated the amount of parking that season tickets holders are willing to purchase.
I feel after all the season tickets holders have made their choices there going to be many available spots on the East Bank. Now what the U will do with the unsold allotment is another issue. If there are 80 spots still available in lots C33 or C37 for instance, does the U eat the potential revenue? Or do they try to maximze profits and try to sell those spots and potentially pi$$ off people who had to donate at least $1000 in total to obtain said parking passes?