If OP wants to do a S&H discount on "bulk" orders, great, but I don't mind either way.
I'll be a bit chafed if there isn't a discount on shipping for "bulk" orders. ~$55 to ship 10 USB devices through USPS from UT to OR is exorbitant.
I would be and have felt 'chafed' when I get overcharged for shipping in small items. This has happened a lot to me on e-bay. I make a point of commenting one way or the other when about how the supplier handles things.
I am a single unit customer here. If ~arklan continues to be as pro-active and reasonable as seems to be the case so far, I will add at least another 0.1 BTC. If ~arklan can see his way clear to offer a shipping discount to those who require less workload and cost due to multiple unit orders it would be fine with me.