Earning a carefree life in the game (The Witcher 3: Wild Hunt)

In general, I came across in one public on such a Temko. There, with screenshots, a method for accumulating capital in the game is described in detail, in a completely legal way, but with some tricks and knowledge of the economy and prices. Screenshots are attached below for anyone interested.
But the fact is that personally this method did not work for me. And all because the merchant does not have the necessary items that you need to buy in order to start your "business" the
necessary item is precisely there are no "sea shells".
So the question is, is it a bug? incompatible version/fixed? (I play on 1.04, which version the author of the idea of ​​earning played is unknown). Who will try this chip, please unsubscribe, did it work or not.

Way of earning: