I do really like the sale feature, though it was pretty confusing how they rolled it out while having a sale themselves. In the future, hopefully, people can just have a sale without it being a big deal, and you'll be able to purchase sale cards either in "Simplified Shipping Mode" or "Advanced Reseller Mode" (or whatever they call it).
Alternately, I'd like to see a system where the 25 cents you pay in "Simplified Shipping Mode" can be applied either for the handling fee of ANY card (not just the one you bought) OR, it can be used for a processing fee on one card. OR, you could sell the credits back to COMC for a slight discount (say 20 cents each).
COMC: Thousands of prices have recently been slashed! Auto accept is currently at 35% off asking price for a limited time.