There's a mix of prepay v. pay after stations around me...
Personally, I never prepay where possible (I get a 3 cent discount for being a student
- but I gotta pay after pumping). A friend of mine happens to be in the gas station business - the convenience store sales outweigh the fuel stolen in drive offs... At least according to him in his region.
I, for one, am happy that the decision is based on what the customer wants - and not fear based.