I Think people will collect what they associate with there younger years. As in the collector car market, The values increase as the people reach an age where there is more disposable income. We have seen the values of antique cars level off (model A, Model T) as the people who has the desire to own one these cars actually purchase one. The current activity in the muscle car segment shows that the motorheads of the late 60's-70's now have reached a point in there lives they can afford a muuscle car, I think the same holds true for the gasoline collectibles.