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Ancient Mariner
Yes, agree with @TheTalisman . Maiden already made millions, sure, but I think there's definitly a correlation between the last 10 years (or so) dwindling CD/DVD sales and Maiden's increased focus on concert tours and other financial ventures (games, beers etc) When DVD's were all the rage they put out a DVD almost every year (in the early to mid 00's) but nothing since 2013!
It's pretty easy to see that this is the case with new Maiden albums too. There's not enough sale in new album releases anymore. They are useful when you need to get out on the road again - but if you can extend other tours two or three years becasue the demand is there - then you might as well do that, lower effort but same financial gain. Same with the DVD's they stopped putting them out since 2013 because it's not worth the cost to produce anymore with the sales they'd make on them.
Singles as well. They used to be a huge thing for Maiden, multiple formats and b-sides, classic artwork, then just abandoned practically overnight when the format died.