I think it's weird the embassies are issuing warnings. It's not like it's a Japan only thing.
This is what embassies do. It's their job. They hear about a threat to their countrymen, and issue warnings...whether it is swine flu or credit card swappers. If they do nothing, people are outraged, if they do something, people are outraged.
The warning is long overdue. A person I know was a victim of this scam almost 2 years ago. He was hustled into a club by one of the many Nigerian doormen you see on the sidewalks in Roppongi. He had a few drinks and passed out. He woke up hours later and took a taxi home.
A few days later he is going over his accounts and found that nearly $3000 was charged to his credit card at this club. He called his bank to tell them that he hadn't spent that much money. But he admitted that he had gone to the club and passed out while drinking. That it was only 3 drinks didn't matter, the bank said that he should have been more careful, and that he would be responsible for the charges.
Perhaps now he'll have the grounds to contest the charges and have his money refunded.
If you go to a bar or club in Roppongi (or anywhere else), don't go alone, and don't use your credit card to pay the bill. A wise person would not even bring a credit card into a bar or club, and only a limited amount of cash.
im telling you if that was me i would get hold of a sub machine gun, go back to that bar and spray everyone with lead including the stupid doorman who conned me.
Roppongi has not been cleaned up, the bars (and streets) still smell of urine, and at almost all hours you can see drunks staggering around like extras from a zombie movie.
Roppongi is about as close to Tijuana as you can get in Japan, except that the prices are much higher.
Totally, the place is like your average UK inner city on a friday night. Packed full of drunks mooning each other, streets stink of urine and the clubs are absolutely awful. I'm honestly surprised that there aren't any stabbings going on night in night out over there.