I know this is a re-hash of re-hash'd topics mostly likely started lotsa times before, but why not ask again!

Just for giggles I just looked up the cost of 120 Portra 400 in 120 and 220 sizes...

singe roll: http://www.bhphotovideo.com/c/produc...ortra_400.html
pro-pack: http://www.bhphotovideo.com/c/produc...ortra_400.html

single roll: http://www.bhphotovideo.com/c/produc...ortra_400.html
pro pack: http://www.bhphotovideo.com/c/produc...ortra_400.html

$5.85 vs $15.19

I can understand "double" price, because you're getting 2x the amount of film in length. But charging well over double? I mean, is it THAT much of a convenience factor, even for trigger-happy wedding shooters who don't understand the meaning of "a bottom line" and should probably be shooting 35mm instead ?

I don't shoot much color neg film, but the price difference astounds me. Seemed not that long ago that 220 was just over 2x the cost of 120...
Any ideas? I know it's a different base(it's thinner, duh!). I know there's no paper backing(just on the edges).
So what do you think gives the rather large price differential?