People about Cosplay...
It’s a way of expressing your love for a particular anime/manga/video game series. You enjoy the world the author created so much that you feel like dressing up as one of the characters. It’s a tribute of sorts.
It’s fun to take a break from your real life and escape into an anime/manga/video game world, even if just for a day at an anime convention. You get to be someone else for a bit.
Great cosplayers draw crowds of convention-goers, get their picture taken by lots of photographers and receive lots of compliments. It’s flattering.
When you walk through a convention and see other cosplayers, there’s a sense of belonging to a community of people with shared interests. People make eye contact, smile when they recognize your character, ask to take pictures and are generally pretty friendly.
Some people really enjoy the process of planning and creating the costume. Making armor, sewing, and building weapons can be a fun and rewarding hobby.
The only place it should really matter is in competition. Don’t enter a workmanship based contest with something that you bought or commissioned, and don’t take credit for the work of others.
That said, some contests have a category for commissioned or purchased costumes, you would be fine if you entered there.
I think cosplay is a bit of an art form. A lot of time goes into some cosplay, especially the more meticulous, detail oriented costumes. Because of that, it’s more than just “dressing up” to me. I see it no differently than movie costumes or FX makeup in terms of seriousness. Some people even make careers into it. I assume some others are able to break into other careers like acting or the aforementioned FX makeup.
It’s not everyone’s cup of tea… and I respect that. However, there’s a lot more that goes into cosplay than what people see at face value.