For the most part I do not think CRHers ordering too many boxes are to blame - most of the time - when banks "cut off" other CRHers and/or begin to impose fees for buying or dumping. Banks and coin courier services are just "feeling the pinch" of this horrible economy just like everyone else. People aren't/can't borrow(ing) like they were a few years ago, and the banks' profits are dwindling. The banks are looking to regain those lost profits any way they can. Many are beginning to "nickel-and-dime" their customers. Services that used to be free aren't anymore. For example, many banks that used to have free checking now do not, or at least have raised/instituted a minimum balance requirement to avoid monthly fees. It is my understanding that some coin courier services in some areas (Loomis for sure, others I don't know) have increased their fees to the banks mainly due to higher fuel costs. So, banks are also looking to reduce internal costs. This would include everything from cutting back on office supplies to ordering no more rolled coin than is absolutely necessary to keep costs as low as possible. In short, CRHers didn't cause the problem, the economy did. CRHers just got caught up in the crossfire.
With that said, so far I have had absolutely no problem ordering or dumping. I currently only get 4 boxes of halves a week (along with an occasional few boxes of dimes, nickels, and pennies), but I don't think I would have any resistance (yet anyway) if I wanted to order 100 boxes. If the boxes here produced better, I would be ordering about 20 a week.
My advice would be to order as many boxes as you can handle while you still can. If your order bank is going to "cut you off" in the future, they're going to whether you get 1 box or 20. I say get what you can while you can. The day may be coming when you no longer can get anything, and you'll wish you had done more volume while you still could.