When I get into something, I get into it HARD. I grew up super poor, so I think now that i can actually afford stuff as an adult, I tend to swing a little too hard when I get into new things. The thing for me is that I'm a fan of things, but I generally don't get deep into a fandom, because that's where you start running into apologists that defend things even if they're objectively terrible, or can't accept when stuff changes. Honestly, as far as associating with other fans go, Tamas and anime are probably the deepest I've ever gotten. As far as actually collecting, I mean... I have an entire room in my house for my Transformer collection, so there's that. XD
And for me, my main 'fandom' goes beyond a single franchise because I like mecha. I love big robots, and so I take a little from everything, diving DEEP into the things that REALLY grab me, such as Transformers, Mugenbine, and Gundam.