So basically, you're upset that in order to trade on THEIR name as an AUTHORIZED repair shop, you can't use cheap parts that may or may not be dependable. And then you're also upset that if you violate a business contract that YOU VOLUNTARILY SIGN and GET CAUGHT doing something against that contract, you have consequences.
Why did your old customer get on Apple's do-not-sell list? Were they committing fraud? I've seen a few companies end on up those lists over the years, and in EVERY case they were buying products in volume to secret move to other countries or sell into education, again, directly in violation with a reseller agreement if not EXPORT LAW. And given that, why were you trying to be a part of that? Is also a HUGE part of the reseller agreement that you will not help someone who has been busted for fraud by Apple skirt their punishment. I'm sorry, but it sounds like all of your objections are because you are trying to avoid running an above-board operation.
How about instead of complaining about legal handcuffs, you instead get on the phone, find LEGITIMATE customers, and work harder to sell more and meet some volume goals. Apple works with resellers when they can't hit some milestones as long as you put in the effort and have a plan to get to where you need to. Again, I know this because I saw it with my own eyes.