I noticed that the only time you can select whether a product is supposed to display the buy button is during the creation of the product. It would be very useful to be able to have this button available after the product has been created. It would allow customers to implement NC and have their website up and going even if they are not able to go forward with e-commerce yet. I guess you could say you would enabling CMS.
It would be very useful to be able to have this button available after the product has been created
Go to your product details page (admin area), then 'products variants' tab and go your product variant details page where you can change this property.