That's a great story Cathy! I teach scroll saw lessons at Woodcraft in Ventura, CA. To promote my classes, I have several pieces on display at the store. I got a call from the store owner one day who had a customer who wanted to by one of my pieces and wanted to know how much I wanted for it. I told him $50, and he said he would call me back and let me know. A few minutes latter, he calls back and told me the customer thought it was not enough and paid $70 for it!
So yes, It does happen!