If you end them immediately, you have still been charged the 10-cents, right? Do you then ask eBay for a whole bunch of FVF credits?? That would seem like a big tip-off to eBay.
Then, when you relist, you are charged another 10-cents. So, it seems to me you are actually paying 20-cents total. Still pretty good, but I just wanted to make sure I was understanding the concept correctly.
Last 10-cent day, when I ran out of time, I listed a bunch of items that I already had saved, then I immediately revised them into new listings. Also, to save time on special listing days, I sometimes will list without a picture and then take pictures and add them the next day.