I frequently raise the point that digitization has meant that artists and record labels alike have sought to monetize other areas, and booze is a prime example of how wide this move into branded merchandising is. Take the example of Iron Maiden - they don't just sell one branded beer ... they have a whole website dedicated to their beer line! Smart branding.
See TeamRock article for lots of other examples (and a nice Megadeth intertextual ref).
(and here's a further update:)
I mention beer as a great example of merch - you can buy both Slayer and Iron Maiden beer in Luxembourg (Auchan), and Motorhead, plus some other branded wine/spirits if I recall correctly. That this is now a common strategy, especially in heavy metal, can be seen from a simple google ('heavy metal beer'). See this Pinterest for a gallery (pic, right comes from it):