The vast majority of clocks in the US use 12 hour time. 24 hour time just isn't used here outside of limited applications (military, computing, etc).
People generally aren't used to seeing time expressed in a 24 hour format. Most would choose a clock that shows the familiar 12 hour format over a 24 hour one that requires them to subtract 12 to get the time.
I think it would be similar to selling a Fahrenheit thermometer in Europe. Most people could learn to do the conversion, but they would probably just buy a Celsius thermometer instead.
People generally aren't used to seeing time expressed in a 24 hour format. Most would choose a clock that shows the familiar 12 hour format over a 24 hour one that requires them to subtract 12 to get the time.
I think it would be similar to selling a Fahrenheit thermometer in Europe. Most people could learn to do the conversion, but they would probably just buy a Celsius thermometer instead.