No, it doesn't bother me.
In a lot of cases, these "resellers" save equipment being thrown into the trash. If they have to buy it for $x then someone else always has a chance to buy it for $x+1. If later they want to sell it for $x+2 then that is their choice because they're the ones who were willing to purchase it in the first place.
That said, someone who talks another Amiga user into selling something cheap because it is for "personal use" and then throws it straight on eBay with a huge mark up is a size 10 tosser.
I also don't get the hostility against large "buy it now" numbers. You either pay them or ignore them. It is very simple.
At the end of the day an item is only worth what someone is willing to pay for it. A greedy seller will get nowhere without willing customers.