Some of us don't have the luxury of waiting.
I live in the Bahamas, and there are no Footlockers, Finishlines, or Nike Stores over here. There are really only about 2 or 3 legit sneaker stores over here and they damn sure don't carry sz. 14 or 15, which is the size I wear.
So my only option for copping kicks I want is online, but even that has its restrictions. NDC, Eastbay, Footlocker, and most of the other sites don't accept Bahamian credit cards. I primarily make my sneaker purchases from NBA Store.
Given the limited retailer options and how it difficult it can be to secure the larger sizes I can't wait for a shoe I want to get marked down. If I want a shoe and it's within my budget I will cop at retail price.
If I was still living in the States it would be a different story.