I guess it doesn't bother me. Apple obviously fixes and tests the broken returns. I guess it's more psychological. I would rather have an iMac return than an iMac repair.
I guess it shouldn't make a difference since they are all covered by the same warantee, and there is an Apple store about 15 min from my house.
At this point, the question is should I buy a refirb from the Apple store, or a new one from an online retailer and avoid the taxes. The refirb would be a little cheaper, but in the same ball park.