@Ghost You know, now that you mention it:
WITH apps like Venmo out there... that makes someone with a Square even more suspicious. Like, not even with the difficulties of obtaining a Square.
With Venmo, you are able to go 'Hi, this is more secure, you don't have to worry I'm skimming your card, you can just scan my QR code and decide your amount on YOUR phone without the device being in my hands the whole time...'
I can see why someone shoving a card scanner would, for a few reasons, be really uncomfortable.