It's true! I've been thinking about that lately. I just bought a secondhand 2003 PRS (mahogany) Soapbar online, because they don't make them anymore, so there was no option to buy a new one.
At the moment, secondhand PRS prices seem to be really good, when compared to the 'G' brand. There seem to be many guitars for sale which 'look' in excellent condition. The one I bought was advertised as hardly played, so I paid more than I should have, because condition is important to me. I haven't seen my purchase yet, I hope that it's as good the seller claimed.
Not only do battered Les Paul's fetch a lot of money, the company even sell them in that condition, the finish on my '59 Reissue was dull, the hardware was tarnished, the screws rusty, and this was a NEW guitar! They even sell new guitars that have been 'professionally' battered, by a guy employed at the factory to do just that! I think that people who buy 'aged' guitars should seek professional help!
Something to consider, is that a very good condition secondhand PRS USA guitar can be bought for US$1,600. This is incredible value! Just consider what you get in comparison to an SE. It may have high quality components like locking tuners, pickups, nut, aluminium stoptail bridge, much better wood, and a hardshell case! Add these together, and it makes a new SE look positively expensive!
I'm a great believer in 'well cared for' secondhand guitars, all my guitars are secondhand, even the new ones; the guitars I have bought new were hanging there in the shop and had already been played by many people!
Just don't buy blind like me, have it your hands, check it carefully, if there are no problems and the price is right, buy it!