Well hopefully you can't harm your computer with userland programs. Windows is perhaps a bit messy at this, generally, but Unix-like systems have pretty good protections against non-superusers interfering with either the system itself, or other users on the system.
Having drivers run in the kernel and applications run in userland also means unintentional application errors generally won't crash your entire system. Which is pretty important..
This is going to be an effective way to tank the Google/Yelp review score of your restaurant. And pay toilets are also stupid in Europe, I say that as a European.