In Jan.1995 I bought a 94 Impala SS with 43,000 miles on it for $11,000. Resale value was awful because of such high mileage and at the time, Mags like Car+Driver and MT said "who would want this car?" , "who ever heard of a four door SS" and "it looks like Shamu the whale". Once they were gone, the value just grew. Why? It's a 260 HP, 4200 pound four door. Aftermarket parts for LT1, awesome; and Everything you could want for brakes, suspension,etc. easily available. With 95,000 miles on it, I've rebuilt the trans, brakes, suspension and bolt on mods for the motor. So in ten years, nothing much more than maintenance costs.Cult value today allowed me to sell that car two months ago for $15,200. For $4,440 more, I bought a brand new M6 GTO, from a very unhappy dealer who feels GM screwed HIM by marketing the 05 as they did.
The LS1 GTO has every potential to be just as defiant of "normal" depreciation in my opinion. 350 HP, 3700 pound two door, no less or more ridiculed for it's "styling" than the 94-96 Impala SS. Notice that it didn't matter that for the last ten years there were lots of faster , better cars than the Impala SS.
PS. I've got a T-56 conversion 94 Caprice/Impala clone that I've invested $8700 in, with a book value of $2700. I've been offered $16,000 for that.