People about cosplay...
No, it is perfectly normal to buy a cosplay costume. Even professional cosplayers buy or get the costume made from someone else. However, making your own costume has a different thrill to it.
What is important though, is how you carry the costume and how much fun you’re having while cosplaying.
As for “devaluing someone’s participation” goes, some may feel that your cosplay is superior to them, when they took more efforts. However, it is not supposed to be that way as these things are done for fun.
To me, it’s equally a tribute to the property that I’m making the cosplay from, and the art form.
One could say the same thing of not getting the appeal of creating any media – learning any instrument, painting a picture, writing a book. It’s creation and display – this may not be the same to everyone, but it’s definitely a big part to me. It’s also a way to meet new friends from all walks of life. I’m certain if you looked closer, a lot don’t meet the stereotypes of an overgrown kid. I cosplay with people in the military, aerospace, tech, and all walks of life. Conversely there’s people that do this for a living, myself included.
As someone that enjoys hobbies and media that was formerly shunned for being “too nerdy”, perhaps immediately throwing anyone that takes part in cosplay into the “you’re a man/woman child” box is a bit reductionist, and a little offensive.
I enjoy comics too, mainly Judge Dredd, actually nothing else to think about it. I’ve got T-shirts, computer games, loads of comics / books, an Oyster card wallet, badge and cufflinks of JD. You could say I’m a fan. At comic conventions I take interest in seeing the various folks in costume. It’s not my thing, but I get their enthusiasm.
One of the team on my current client in Holland is a huge Star Trek fan. He has all the films and all the episodes. At the moment he’s collecting a part work of all the space vehicles. He goes to events but hates seeing anyone who dresses up and is out of character. “No one from Star Fleet smokes, carries a beer or spends their time on an iPhone”. He doesn’t do cosplay but appreciates those who take the time to add something to the atmosphere of an event by doing it well.
Watching my shy 8 year old and his 10 year brother with the Star Wars guys at a convention made my day. These people enjoy spreading joy. To me, that act of generosity is a big appeal.