Will bartenders hack your Point of Sale? (opens in new tab)

I'd guess, as a co-owner of a shop myself, that the reason medium sized retailers spend a lot on POS is the same reason they don't represent themselves in court. It looks easy, you might get away with doing it cheaper, but there's a lot that can go wrong and a lot at stake if things don't pan out. Paying someone to pull you out of a hole is more expensive than paying someone else to dig it in the first place.

Pretty funny. Although I kinda hoped it was something else. Like a cool point of sale system that could be extended by its operators to provide fun new functionality with an intuitive graphical interface.

The real problem here is that most restaurant owners are too ignorant to realize when they are getting fleeced by a POS seller.

This article is well-meaning but totally misses the point:

It doesn't matter if your POS is built on open source technology if someone has the ability to install new software onto it.

i.e. UltraSecureAwesomeClosedSourceOS is just as vulnerable to having new (rogue) software installed onto the device as any other OS. The hardware or firmware should have controls in place to prevent this or make it extremely difficult, regardless of what is running on top.