What are the pros and cons of this ? Can this increase sales in the physical store because some would like to spend crypto in bulk which they are getting from some source ?
The pro of having an option for customers to pay with bitcoin and other cryptos in a physical store is that it attracts bitcoin enthusiast who want to pay with bitcoin. That is new customers and increased sales.
This pro is location dependent. The physical store should be in a place like an urban center where you have people who are likely to know more about bitcoin.
The con that I can think of is that if the store owner don't have a system to manage the bitcoin coming it, they may lose it to market instability and that can affect the revenue of the business.