Hmmm, it's been a few years since I've looked at them, but I seem to remember a problem with their certification in the US. If I remember correctly, aren't they certified in the Experimental/Exhibition category? I believe that would prevent anyone from renting one out, even for checkouts. AFAIK, there is no commercial use allowed at all.
Which really sucks because it's such a phenomenal airplane. I think the FAA was afraid they would catch on, and thus do some real damage to the utility/bush aircraft market. JMHO, I could be way off.