Now let's compare that to buying a prepaid timecard in a physical supermarket. Pretend you're the CFO going to pitch the adoption of a timecard system.
Everyone knows what a timecard is. No one knows what a bitcoin is. See the difference?
I actually had to guess from the name (and then Google to verify) to find out what a timecard is. That you (and a bunch of friends) know what something is, does not mean the entire world knows.