I was looking at a Fender Modern Player Jaguar on eBay today. £350 bin, didn't sound much to me for a Fender until I Googled them and found you can buy them for less brand new. I just laughed.
I wouldn't let it get you down, it isn't really your job to police the secondhand marketplace. And if it so happens you want one of whatever they are offering but it isn't rare, one will come along at the right price soon enough. They always do.