Well let's not start with the AM parts as being easily damaged, the OEM are just IG-NOR-ANT when it comes to this. They make a friggin textured plastic bumper that is as fragile as a darn potato chip and put it in a plastic bag! I had two from GM damaged this past week, $350 bumper put in horrible wrapping and damaged.
No the AM has it's place, it's nice they exist, to save a 10 year old car from the wrecker, that's great. But when they want you to use all aftermarket stuff on a one year old car, that is just nuts!