I do it, but I don't feel like I'm in the "right". I just can't afford buying every single album out there of the artists that I listen to, but I support them nonetheless. Spending money on your fandom is not what makes you a good fan. Imo it's devotion and passion among other things
Generally speaking, if there's something I just
worship, I try my best to save up and buy it, if I don't have the money for it right away. I have my favorite album ever, which is one of my most treasured possessions. As for Ayu, I have a rule to never buy singles, but I always try to buy her CD+DVD ver. albums. I started when I got GUILTY as a gift and I've continued up until Love Songs.