All answer to commercial questions...
Hot dog is only available in MediaMarkt Germany version as it guarantee an exclusive, any fan that wants that song has to buy that version.
Same happened with "time in the sun" and "early bird" that were exclusive bonus in digital purchase from iTunes and Amazon and you had to buy the whole digital record to just get the bonus.
Commercial strategies.
Me, by the way, prefer to buy something material, like the MediaMarkt cd, digital files are something too... Untouchable. I'm an old fashion man.
Mk has very little to do with this. He delivers to the record company the songs that will feature in the record, and the record company ask him for bonus tracks to the different editions and exclusive. The record companies are the ones that decide the commercial strategies to follow with that extra material to get all the money they can from us in as much different ways as they can.