If you buy an iPhone from a carrier, or the Apple store, jailbreak it and 'brick' it, Apple/the carrier won't simply take it back...the warranty has been voided.
If you buy a lamp from a store and it gets smashed when it's in your home because you precariously placed it on a shelf you can't get a refund (easily), it's your fault -you broke it.
And on that note, I'm sure the good folks over at Empire Security wouldn't appreciate a rash of 'bricked' items if the tides were turned and they were selling these kits.