There's a lot of misinformation about the 4 copies per transaction vs. credit card limit for sales.

It is 4 copies per credit card/mailing address, NOT per order/transaction/shopping cart.

1-4 copies count as they are.
5-9 count as 4.
10+ is bulk-buying and counts as 0.

Because of this misunderstanding being even on the label level, the D2C store for Dynamite encouraged multiple carts of orders.

From information on figures we received, this resulted in 30% (~129k) of the total sales being tossed in vetting to arrive at the 300k result.

Also note this is per version/UPC. A remix and instrumental count as different versions, so you can buy 4 of each.