Fabrizio, these fakes/copies are technically counterfeits, the term meaning they were designed to be sold and passed off as as genuine Leica's.

The best of these counterfeit Leica's have become collectible in themselves but it's a very small specialist "niche" market for these cameras. Some are far better modified than others, have been completely rebuilt to feel more like a Leica mechanically, I mean smoothness of action when used. I saw an article a year or two ago where it was mentioned that some are fetching higher prices than the genuine article.