I worked in retail for over 20 years. Seemed like every time we try to do something good for a shopper, someone would come up with a way to ruin it for everyone.
We found most times when people wanted a price match it was because the original ad from the competitor was an misprint, store was out of stock. only one was available per store at that price etc......
Here is one example of a store getting scammed.
http://www.businessinsider.com/walma...-scams-2014-11
I have never heard of a store doing price match on Black Friday deals.