I'm sure applying 50 layer has made the owner happy... clearly, he's made a little sign for it. Fair play to him.
Whether or not the 50 layers make a difference is a matter of debate - well, it isn't really, I think we are all pretty much convinced we've long going into the law of diminishing returns there, but at the end of the day, if someone wants to layer 50, or 5,000,000 layers of something on their car, thats up to them
My Volvo is looking pretty damn sweet with 5 layers of Z2 and Z5, topped with Z8... just going to wash and top up with Z8 every so often now, though given how easy the Z8 is to use and how nice it smells, it may be getting this every wash!! LOL