I have yet to see anyone actually wear out a zinc alloy razor.
As to the gold plating: Gold plating is not usually that durable on anything so it may wear off after time but there should be a plating underneath it to protect the metal. If you want real longevity I would go for the chrome of the matte finish, they will be much more durable.
The pop-off top is a cinch to use. It's much easier to use than most three piece razors. Don't worry about the razor getting worn out. It won't if you just use common sense and take care of it, like anything else. If you abuse your tools they won't last as long. Clean it periodically and it should out last you.
TOFLAC-U, AOM, LEMS/ Stay back! I have a Merkur, and I know how to use it!