Depending on how the dealer works numbers, it is very unlikely that I buy it.
As for legitimate uses:
1. At some point, I would like to start taking road trips. A Tesla would allow that (and would be able to tow a small camper trailer).
2. Given the rumored end of production for the i-MiEV, I don't want to continue racking up miles on a car with so few copies in the US. I would still drive the i-MiEV most of the time, but I would defer a fair portion of trips to the Tesla, especially longer ones.
3. I rarely drive Koorz (my Dad drives it the most for going back and forth to work). A guy has asked about buying it, and I might sell it. I don't regret the purchase, as it served some very useful purposes last year (RV show display, something to drive while Bear was getting the battery replaced, loaner for my brother when his car blew up). I could likely get most of my money back out by selling it directly (others on lots in the area average $8,000, I paid $10,000).
This Tesla is optioned almost exactly as I would order a new one (minus the Performance). While AutoPilot is really neat, I think it would either cause more fatigue while on the road or make me totally bored, depending on how the latest firmware behaves). I don't miss it, and if that saves a decent chunk of purchase price, I'll gladly do without.
This is a P85+, so it has the bigger battery. I want the Pano roof (still miss not having a sunroof in the i-MiEV), air suspension would save a lot of scrapes (I guess air suspension required tech package at the time), and like you, I prefer the 19" wheels for cost, looks, and tolerance to rough roads.
Used Teslas in western PA are still rare, so there's a bit of premium added on. Bottom line, it depends on final price and how it drives (so, yes, window shopping). The Roadster I drove was great except for trying to turn around and pulling into driveways, due to sitting low and lack of power steering. The Model S is more of an everyday car, but I worry about the width and how the throttle pedal is mapped (I'm too used to simply planting it and letting up as I approach my desired power level...led to a few tire squeals when driving an ICE
). This will be discovered during a test drive.