I don't know if I even have a justification for it that makes logical sense. A lottery system just doesn't feel fair to a passionate fan who I feel might enjoy it more than someone who just signed up for a lottery and got lucky on a whim.
I don't have any examples of a lottery system to speak to because I've never been to a JP concert but my friends deal with it all the time. They fly to Japan once or twice a year for Jpop/Idol concerts and their trips can get completely ruined if someone isn't able to get tickets in the lottery system or find them on the secondary market. It feels shitty.
I can provide a perfect example of a first-come-first-serve basis, though. The Yoko Kanno piano.me concert at Otakon last year was something I was really, really, really excited for. In fact, it was the -only- reason I went to Otakon at all. I made sure I was in line to get a ticket to the concert and I stood there for a good 6 hours and got my ticket. I then sat in line the following day for another 6 hours to make sure I had a decent seat to the show. If this system was a lottery based system and I wasn't fortunate enough to go I'd have been absolutely devastated. Same thing with the Joe Hisaishi Paris Tsunami Relief concert i attended. It was probably the most accessible and only opportunity I had to see him perform and if I was subjected to a lottery system and wasn't able to go, I'd be really upset.
I don't know. It just feels really shitty when you're not able to control your own fate, I guess. Particularly if it's something you're truly passionate about.