I picked up a Jake the Dog costume and wore it when I went to pick up my daughter at the movies. I was planning on possibly embarrassing her, instead I was getting honks and hoots, and waves - it was like I was a celebrity! After a few minutes, I was waving at people, and giving thumbs up, and the like. When I found my daughter, she wasn't all that embarrassed, and just kinda went, "Oh, that's my daaaddd", with a smile.
Had I not experienced that myself, I might not believe anyone would don a costume for the sake of vicarious adulation - but, it was pretty fun, so I think I can see that.
Mind you I wouldn't hang around a school (in any costume) waiting for kids to come out and adore me - I would be worried that I would look like a creep; and I certainly wouldn't walk around with anything that looks like a genuine firearm.