Originally Posted by MaddMax
WRXs hold their value just as good as the STI, if not a little better.
Then there's the fuel mileage. For whatever reason, the STI sees about 15% less MPG than the WRX. For 10,000 miles driven in a year at 91+ fuel at ~$3.80/gal, you're looking at an extra $450-500 in annual fuel costs.
From what I've personally seen, they don't. I know 2 people who sold 2011 STis for within 1500 bucks of sticker. The person I know who sold the wrx was about 2500 under sticker. It's going to vary wildly by area though so no real formula can be made to cover all sales/trades. For me I am more interested in the fact that a modded wrx will sell for the same as a stock one. So modding the suspension/wheels/bushing will not retain value per say.