As promised, I held my garage sale and promoted the fact that I would accept credit card payments via the Square device. I wondered if that would drive sales and the conclusion is no, it did not drive sales. Garage salers generally carry cash.
However, it did save a sale. I had a picnic table for sale and a woman was going to leave and get more cash. I stopped her from leaving and told her I accepted plastic. She was shocked. I whipped out my Square and demonstrated the process. It was like performing a magic trick for a kid. She was so taken aback and curious! Off she went with her new (to her) picnic table!
Side note: I visited a UPS Store yesterday and they have Square devices for sale for $12.95 each. That seems odd to me when anyone can get them for FREE online at Square.com.