Seems to me it's aimed at those in the USA who would like the Fuji or Rollei kits without having to pay international shipping. That ought to be a decent market segment judging by the quantity of whingeing here on APUG about yanks having to pay shipping like the rest of the world does!

I note you have an error on your product page though, it says "Capacity 5L: 50-80 rolls of 35/120 or 100-160 sheets of 4X5". Actually it should do 200 to 320 sheets of 4x5 since those are only 20 sq.in each compared to the 80 sq.in in a 135/36 or 120 roll.