I think for the loss of investment value in the car you should consider moving your abode to a location more suitable to driving your Boxster.
I recommend a warm climate, hilly, mountanous or canyoned area with roads designed by cross eyed road designers who can't draw a straight line if their life depended on it.
Kalifornia Here we come!
Real Estate and mortgage rates are low now so its a good time to take advantage.
( "Mort" the latin abreviation for Death

)
Quality of Life is often overlooked in ones life adventures and obviously the Boxster is a passion of yours. Selling it will likely lead to depression and anxiety.
I think you should seek counseling before you make any rash decisions to sell your pride and joy and get to the bottom of your malady before you do something you will regret.
I mean really, what brings you more joy, a wad of cash that will get spent into thin air, or driving with the top down on a nice day in your beautiful Boxster, even if only occasionally, when ever the urge/obsession strikes you?
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"It broke because it wants to be Upgraded

"
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)