It's only bad if you go at it with the mentality of getting it done as quickly as possible. That's what creates the grind that burns you out. I have Novus on summoner and atma on WAR, WHM, and MNK. I'm still about 500 light away from Nexus. But I don't play summoner all day every day just to get light. If I want to run as something else, I do it. It's more important to enjoy yourself.