Why would you go with propane? Natural gas is ubiquitous and everywhere (at least in the US). Maybe it's less so in the south? In the north it's mandatory for not dying in the winter unless you're so rural that you need to chop wood to stay warm.
Then again, a lot of people don’t realize cable internet isn’t a given, even within 15 minutes of the capital city of a state in the contiguous United States. They also don’t have natural gas available. :-)
Copper telephone and electricity are the only two utilities you can count on in the most rural 10% of America.
I don’t think anybody chooses propane over natural gas, but natural gas is unavailable to a great many people.