This is a bit groundhog day, or rather year...

Every year there is the same problem, then the same suggestion (which is good), then someone says that suggestion is good and will be sent to the techs, and then the next year we are merrily doing all the dance again.

So, another year is gone and...

• I understand that you need to enable the "add to cart" button to allow for multiple purchases

• but you could simply enable the button without changing it from "purchased" to "add to cart"

Good idea? Good idea! You should forward it to the tech people so that they can resist from adding this fix next year... :-)