BTW, I don't know if I'm 'one of those sellers'. I charge a fair price for my items and I charge a handling fee that covers my expenses for supplies. I feel that is fair. My time and gas are not free.
I don't list extra items on 10-cent days that I don't have to sell. I don't list dummy auctions of any kind. I sell textbooks and I have 30 copies of each. So, on 10-cent day, I list 3 auctions for 10 of the books. Then, if I think of something I want to list instead, I will use one of those extra listings and revise it. I feel this is fair because I actually have the items if someone buys them all.
But, that's just how I do things.