Probably something to do with you mentioning next week, or next weekend, to see if the promo happens, to decide whether you open a store or not. Given that it's highly unlikely the free listings will happen again next weekend, you are probably best going with your decision to open a store. For the rest of us, we aren't impatient. We will wait to see if eBay offers the promo again at the end of this month. If they do, great, if they don't, well, nothing really changes.

Edit: you're wishful thinking of it being a weekly promo. "However if it does turn out to be weekly, for however long it lasts, I'll probably stick with it."

Your words, not mine.