I am amazed at how Subways Sandwich Shops have grown so rapidly. They are now found all over the States in different storefronts: stand alone, in strip malls, at gas stations. The franchise was cheap 10 years ago when my buddy in Atlanta begged me to buy one as he bought 2 at about $25,000. I told him it was haram for me to sell doofar even though he was a much more pious Muslim man. The franchise now costs over $100,000.
The costs for start up are not as expensive as McDonald's which requires at least $1,000,000. There is a healthy eating craze. There is no cooking to be done on site.

The only two franchises which don't sell pig products seem to be Taco Bell & Ka Faraxi Caloosha (KFC) yet both are much more expensive than Subways.