Is it normal for a micro market to not accept cash as a direct payment?

[Apple Leisure 33]

And if so, why?  Is it because they don't want to bother with the equivalent of a coin mech?  How do grocery stores and the like deal with the issue?  It seems to me that forbidding direct cash payment for items is an impediment to doing business.

[AngryChris 1,821]

Some kiosks allow you to load load cash into a card.  I'm not sure what the reason is for not allowing direct payment with cash but it's pretty standard to not accept direct payments of cash.

[lacanteen 2,464]

Mostly security issues, but also the ability to pay back change. Most markets add sales tax and transactions can be in odd cents.