Grey market bikes are a pain in the arse to bring into the country and title and keep and operate on the public roadways under proper tagging unless you have the practically complimentary paperwork that uncle Sam provides to our military personell.....going through the process otherwise is a freaking nightmare....I found this out when I wanted to get a bike from someone outside Montreal once a long long long time ago....
Funny, I worked the opposite pain.... sourced/bought my S4R from a dealer in Illinois while living in Germany; had an importer bring it over all so I could avoid the hassle of trying to import a grey market S4R into the states. Not the cheapest way to ride, but wasn't hassled when I moved back to the states.