That's most likely because they provide a reliable, convenient, and competitive service that no other gas company could compete with, which leaves the needs of your local market for gas fulfilled and satisfied. If something happened and the local market's needs changed or the gas company started taking advantage of it's customers (ie raising prices, forcing payment with some obscure currency, putting caps on the amount of gas you can purchase, etc), an opportunity would open for a competitor and those practices wouldn't last long.
However, lets assume that they do in fact have a monopoly in your area and you were forced to pay in Bank of America bills. What happens when the gas company receives your payment along with everyone elses? What do they do with the money? When they need equipment or trucks or employees, they would be forced to use Bank of America dollars as payment, but not all equipment companies, truck dealers or employees would accept those. So they would be forced (by the market) to exchange it for dollars and pay a fee. They would quickly find that using Bank of America dollars isn't worth it and revert back to dollars.
This is how competion works between currencies. If currency laws were repealed today, I would suspect nothing major, in terms of currencies, to occur for at least a decade. A million companies could start their own currency (regulated by congress of course), but none would be of any value unless it was competitive with the dollar. That means that it would do everything the dollar does with little to no disruption to anybodies life and could be used just as conveniently as the dollar. Otherwise, it would not be competitive and it would be a nonissue.
Again, the key word here is competitive. If something isn't accepted, recognized and trusted nationally than it would never gain any ground on the dollar. So in the example you gave, the company would have to convert the currency and loose money by doing so. Does this make it competitive with the dollar? No, and I would assume that soon after they would drop that currency option and most places wouldn't use it. This would also cause you to exchange your holdings of the currency with something more trustworthy, perhaps the dollar or gold. Eventually the currency would be wiped out of existence.
There's an example of that today in credit cards. Discover card charges vendors a premium to use and accept it, many restaurants and stores choose not to offer that option to it's customers. However, to make the card more palatable to it's customers, discover has to offer some incentives to make the card worth using and they manage to stay afloat.





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