Take my opinion for what you will as it's not the most informed but here goes.
Right now, as some have said, our economy is not doing as well as others' and they can snatch up cars for much cheaper than national buyers can.
For a few more years into the future, we will not see these cars returning to our shores due to very strict laws concerning vehicles in the U.S.
That being said, when we see the 25 year mark roll around for vehicles like these (when they become exempt to such laws) you may see a turn around in the number of cars that make their way back into the states considering their status according DOT regulations (or whoever is in charge of vehicular decisions in the U.S, I can't remember at the moment).
Cliff notes: Our special vehicles are getting cheaper for other countries, our economy is not where it needs to be to maintain these markets and cars within the country, within a decade you will see this change and your business grow because of it.
I sincerely hope that we experience a turn around in the near future as, even though this is a very exclusive market, it's still an important one for many.
Edit: Did h2o say something positive about a Lamborghini?