I can't imagine I would ever show up and swipe my CC through a mobile square or paypal reader. Cash is always king, the Senate Sub Committee just reaffirmed this at their hearing over Bitcoin on Monday.
Would you use/accept it?
Thoughts on how it could impact the hobby?
I've used it. Only for regular, extremely trusted clients. The risk of chargebacks is too great, otherwise.
The title of the "business" could be a red flag for credit card statements scrutinized by an SO, so be sure to ask your provider exactly how her charge will appear on your statement.