In the process, they have ruined some cameras that had historical value, and transformed them into gold-plated or specially engraved junk. This practice will continue as long as collectors and dealers encourage it.
These Gold plated ones are often made of parts from different cameras. They just disassembled a pile of camera's to make leica's out of them.
There are many of them, but they will become possibly invaluable in the future because they lost their original state. Such things happen to cars, music instruments and clocks as well. They are more valuable for a short time, but they become less valuable in the future.
You can get a good original Zorki now for less thans a Copy, and if you save some more over time you can buy a real Leica.
There are people who actually think that the factories MADE such camera's in this shape, which is not true.