[joezydeco]

Because people don't trust the activity LED.

https://arstechnica.com/information-technology/2013/12/perv-...

Has Apple fixed the issue? Most likely. But do you trust Apple completely? Would a $0.50 piece of plastic solve that trust issue?

[NavinF]

Sure but you can just use a 0.1mm sticker. 4 thou is a lot for a camera cover unless it's one of those plastic ones with the sliding window

[joezydeco]

I'm guessing the sliding thing is what most people use. People do use their cameras, but want to be sure it's off when it's off.