Well, not me thankfully.
Over at Applesauce, there's a post about a woman accidentally eating a $62 burger at Laurent Tourondel's joint in NYC. Bummer! Apparently she ordered the American Kobe burger ($12) and received (and was billed for) the $62 Japanese Kobe version. If she was indeed served the Japanese version, I figure it's the restaurant's problem. If you've got two items with nearly identical names and vastly different prices on your menu, your staff better be making damn sure they're getting the orders correct.
I've never had Japanese Kobe, but I can't imagine it would be that much better than any decent local beef, Kobe-style or not. I'm guessing that whole point-of-diminishing-returns thing probably kicks in at around $10 for a burger. I'd be more than happy to be proven wrong; if you've got some Kobe to send me, get in touch.