No. It’s a subscription which you have to pay once a month and some sales only last eg 2 weeks. It’ll be unfair if you’re unlucky enough and have to pay 1 or 2 days before or after the sale.
Next to that, it’s currently a stable way income for cube. If this gets implemented, it ain’t stable anymore as people will just buy it for 1 month and I’m pretty sure management doesn’t want that.