Business that accepts only dollars vs business that accepts dollars and euro and pounds would have a difference too. Lets assume you have an online shop, but you only accept paypal and nothing else, versus someone who would also offer credit card option on top of paypal, that would also have a better result.
This "adding crypto to your business is great" is not really a unique approach, adding more payment options will always be good, if you have just crypto, add paypal and credit card to it and you will get better too. That has always been like that, in any business, make it easier for the customer to buy, so that they do not have time to rethink and give up.
I agree, adding more option to pay make customer using those option to buy in your store. There are times when we have items the customer needed but due to limited payment option, they move to other store. For example, recently I bought some items through online store, I prefer cash on delivery (COD) but the store I usually buy the item remove that option so I don't have a choice but to look for another store that has COD on their payment option.
It would be the same to those who would like to pay in Bitcoin. Accepting Bitcoin in a business really caters more sales and customers.