I have only been selling for a month and am not sure I understand zero insertion fees. The information given seems to indicate that if I auction something, it will be charged an insertion fee at the initial listing & again if I relist; but, if I simply list a fixed price I can have up to 50 zero insertion fee incidences per month (with each re-listing reducing the number left). Did I understand that correctly?
Knowing which way to go will make a big difference - my items have smaller value and could stand to lose most of the profit if I've understood the rules for auctioning correctly.