Well, I certainly advocate not buying it at all...
Anyway, to refer to xhonzi again, if there was another person looking to buy from the same seller of used goods, and person A got it, then person B would just find someone else to get it from. Like I said, the ratio of people who will ONLY buy it used versus the number of people willing to sell it can't be that disproportionate, and the number will only grow in the buyer's favor as time goes on... up until a certain point, when those numbers will eventually reverse, but by that point, it will most likely be very small numbers on both ends.
The problem would lie in how dedicated a potential buyer would be in getting it used. You'd be right if a person wants it used, someone else gets the product, and the person goes, "Well, fuck it. I'll just go to the store."