Think about how convenient it would be for an infiltrating terrorist group to own a string of motels or fastfood franchises. You need to provide a "worker" with a safe cover? Give him a job in a low-skill hospitality enterprise--our friend Shaheed owns a string of 'em in convenient proximity to a soft target. There's a constant overturn of Middle-Eastern employees...but, hey, it's fast food...
I don't know about the rest of the country, but around here (Portland, OR), it seems like 75% or more of the Gas Stations are owned/operated by Middle Easterners.
Al Qaeda says their next attack will disrupt our economy... Easy... just take out every gas station. Economy grinds to a hault in 2 seconds, accompanied by panic and in-fighting.