Yes, it's a bit odd... when you can add a garage costing $5000 to a house worth $200,000 and raise its value by $20,000.
Cars - with few and classic exceptions - always go down in price.
Ken Silver
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~1993 SL500, glistening triple black, xenons:
http://www.kensilver.com/SL
~1999 SLK 230 Kompressor, silver/black leather, CD, immaculate (my wife's)
~1991 Daimler, shiny grey/grey leather, best in country!
~ex 350SL, 230E, 280E, MX5 and a lot of other makes not nearly as nice.