You can do whatever you want, it doesn't mean that Bitcoin is suddenly useful to people for grocery shopping just because you opened a stand. How do you plan to be profitable when the currency is constantly deflating? You presumably have to purchase your goods in USD, so any goods you sell have to be converted, which constantly loses money. No one is going to pay you in Bitcoin because they don't want their money to deflate.

The cause of the thing is more than 'there are no shops'. There are no shops because no one wants to do it.

Prove me wrong. Open a Bitcoin grocery store.