They are not horrendously overpriced on the used market. They just hold their value far better than most other car makers. Would you rather buy a car and have it depreciate immediately?
Despite what you think, these cars do not go up in value. Some people just pay too much for them and ask for more. Just because they ask more money doesn't mean they are worth it.
You can easily pick one up for MSRP (which is actually only $25,795) pretty easily if you are willing to drive out a bit. My BRZ was marked up $5k. I paid MSRP. Dealers are easy to talk down.