The only bad thing is that it would be real hard to register most of those cars here. I want a Nissan PAO (retro styled car that looks a bit like a Renault 4), but it is not over 25 years old yet. Now a Hakosuka Skyline on the other hand would be easy to register here due to age, but it is a highly sought after collectible in Japan, so that would make it expensive. Plus, the Yakuza have been known to "Discourage" exporting them as they are seen as a part of the Japanese cultural heritage.