For my own auction - I have excellent customers that are very friendly, and know what they want. But prices fluctuate wildly, depending on how many people are after the same item at the same time. Sometimes things undersell and I take a hit; other times, things perform better than expected. I don't really care, as long as I'm able to keep my collection basically self-funded; to me, the important qualifiers for any transaction are that (1) The seller is happy, and (2) The buyer is happy. I've never found those ideals to be mutually exclusive.
But for the other two auctions ...
They'd get a better reception if they started their bids low, and left off the reserve entirely. If you demonstrate trust and respect to the potential buyers, they will respond in kind.
I'm tempted to bid on that
PotVQ, but it's simply the rareness-bug that's biting me. I really don't have any use for it in my gaming, or my collection. Always cool to see, though.