Old Faithful Shop review for Point of Sale

All the features on the POS PRO (Upper-tier subscription service) are completely unnecessary for the POS system and can be accessed through the Shopify back-end on a laptop or desktop computer. However, Exchanges are completely necessary and are not included in the free version. Wouldn't mind, but you can also only preform an exchange on a transaction once - if a customer tries to exchange an item they've already exchanged they are unable to do so. The price for this subscription should be at best $30 CAD a month. $120 CAD a month is an absolute robbery. Does Shopify not have enough money already?