i guess it's about the level of investment, be it emotions, time, money, etc. and also what you get out of it. for example, i am a spectator of gnz drama, but i'm not a zhongtai fan (i don't watch, i like dxq though and watch their bzhan stuff though). i think a supporter is a fan, but a fan isn't necessarily a supporter in terms of money, if that makes sense? actually, i think these labels are also kinda arbitrary and you're whatever you want to be. it doesn't really matter trying to label things like this when there's no rubric and everyone has a different way of being a fan