I called..received a pretty weak, scripted response, from a 12? year old that answered the phone.
They say:
"The 6 tier system has went away. They are now basing billing on a 3 tier system. Based on a 6 moth average of part numbers. A letter was mailed out in the last 30 days, to explain the changes that were coming"
I've spoken to 2 other stores in my area, and they are being billed 2 different prices, both lower than mine.
After finding that fact, I called my rep back, and she looked at what her other dealers were paying. According to those numbers, there are still 6 tiers of pricing.
I have requested a copy of this ghost letter, with no answer at OEConnection. I guess I'll see what happens

If the 3 tier system is an accurate future billing excuse, my 4100 parts numbers, will cost the same amount as some of the big guys with 10,000. (based on the local dealer billings I have found)