For starters, we're talking about a very small percentage of the overall population, 2.2%.
Well, that's not quite the right number to look at. So far we only have listings for two shows, New York and Chicago. New York has the 2nd-largest Jewish population, and Chicago the 9th-largest,
in the world. Put another way, New York has four times the Jewish population of Jerusalem, and Chicago has half of Jerusalem. If you look at it that way, maybe they
are onto something.
http://www.simpletoremember.com/vitals/world-jewish-population.htm#_Toc26172080
Here are the top metro areas, so if this is actually the strategy they're following, maybe southeast Florida has a rare shot at landing a metal tour?
1 Tel Aviv Israel 2,560,000
2 New York U.S. 1,970,000
3 Haifa Israel 655,000
4 Los Angeles U.S. 621,000
5 Jerusalem Israel 570,000
6 Southeast Florida U.S. 514,000
7 Paris France 310,000
8 Philadelphia U.S. 276,000
9 Chicago U.S. 261,000
10 Boston U.S. 227,000
When I've seen the band Dengue Fever (an American band with a Cambodian singer who originally came up on Trey Spruance's record label) play in Chicago, I'd say 30% of the crowd has been Cambodian, and I bet Chicago's Cambodian population isn't nearly as large as the Jewish population. And these are pretty underground shows, with maybe 50 people showing up. But somehow they found out. However, their music is probably a bit more enticing to the average Cambodian palate than Orphaned Land is to the average Jewish palate. Orphaned Land isn't exactly a nice klezmer band, and they aren't even Matisyahu.
I've also seen nice old Indian couples watching Buckethead (fucking Buckethead, a 9-foot-tall dude wearing a mask with chicken bucket on his head!) because he was playing with Zakir Hussein.
Then there's the example of Dir en grey, who play some pretty insane prog-death-metal, and the show I just saw was packed with screaming teenage girls. The point there is how it's possible for a cultural association to completely override normal musical preferences. But yeah, a Japan-loving teenage girl is probably more likely to be musically open-minded and culturally obsessed than the average Brooklyn Jew.
So overall, I'd say your calculation of 1.4 is a bit low, but I'd only bump it up to 5.2.
Neil