Really, I believe that as long as you are supporting the band, you're doing more for them than giving Apple your money. Download their music and then go to their shows and buy merch. That'll help them more than anything else.
don't have any other way than to download it... I live in Bangladesh where bands like Metallica, Iron Maiden, A7x, Alter Bridge don't release their album officially. Moreover as in a country like mine credit card isn't available for everybody so buying music from itunes or any other platform is a bit difficult so have to download it can't see any other way to get them!!!