They aren't gonna slash the price or throw out last minute variants that won't actually make them money. I'm sure they'd much a rather a top 20 with healthy profit margins, than a top 10 shifting copies at barely above cost.
Tea, but it's not like there aren't easy wins they could have done this week that would have cost them nothing. For a lot of these week-of-release sales techniques it's just about pushing casuals over the line to buy: discounting on iTunes is easy and might snatch a few extra curiosity sales, shifting some of the existing vinyl or CDs with a signed print would've easily paid for itself, etc. This should be standard for archive reissues or albums of original material now.