How is this any better than looking at the real product on the shelves? I mean, why did the shop want to pay for it?
The ads pay for these.
Probably the fact that you can't see the cheaper alternatives anymore without opening the door.
> Turns out that Monster energy drinks are found in the "no content" door.
So how did he find it? Obviously he went down the line of doors opening each one until he found it. If the doors were glass, he could have looked through each door instead of opening each.