Well, if you're planning a costume for a whole year and then don't finish in time, it's a huge deal, at least for cosplayers that I know. Many of them actually postpone the real-life work before big events in order to finish the costumes and prepare everything. For them it's more of an obsession than just pastime, but still it's a hobby.

Obsession over hobby makes it not a hobby anymore. Been there, done that.

If you keep putting yourself in a position where you have aggressive hard deadlines.. very big deal.