Anyone who has had the chance to talk to me either online, at a convention/event, or even become my friend, knows why I do it. I do it because I enjoy it. That right there is the main reason.
I cosplay for the fun of it. It gives me the chance to escape my daily routine and be who I'm not. I can be a hero if I so wish and pretend like I'm saving the day. I can be a villain and mock all that is good (which is polar opposite to myself). Or I can be that over-exuberant character who wants to give everyone their love and attention. It's partly for the escapism. But it's mostly because I find it to be a lot of fun.
I also do it now because it gives me the chance to learn new things. I have learned how to sew, draft/modify patterns, and make armour. I'm slowly learning beadwork and hand embroidery. I've learned a bit about makeup, and I've learned a bit about hair styling.
That right there are the main reasons that I do it. Another? It's a fun thing that I can do with my friends who also have this hobby. Many of these friends I met because of it!
Sadly, many are thinking that now I only cosplay to be famous. NO. This is far from the case.
My Twitter I use rarely, the most I used it was watching Face Off and Wrestlemania 29. My Tumblr has also become a rare thing, and I don't just post cosplay photos of myself. I use it more for my photography and things that I like.
I will admit, I have come to make a name for myself in the Ontario con circuit, and I'm known a bit in Quebec. But I don't consider that famous. I just call that known. People know of me, that's it. I don't consider myself famous, and that is not my goal.
I just want to have fun in cosplay, learn new things as I go along, and spend time with my friends. If you think I want to be famous, then I wonder how you possibly got this impression.