Can't imagine how many emails and site inquiries they have to answer regarding the no active payment system message, when you can add a product to a shopping cart your under the impression it's available.
As you all know this stuff flies off their shelves, I'm not telling them how to run their business...there's got to be a better way so customers are not wasting their time and the
alien folks time.
Maybe if it's out of stock you just can't add it to you're shopping cart...and when it is you can.