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Shinigamisama: How was giving some free accessories to close-acquaintance counter-intuitive? That too when he didn't even start the business yet and was just asking for external opinion. There is also the notion of Free Sampling or Advertising as well, and those nurses who got those accessories could possibly help spread the information regarding MC's work and would help somewhat increase his sales (ones he official starts the business).
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TsuuChed: That would only depend when the whole economy is based on exchange of precious metals, and the supply gets higher than demand. But precious metals are precious because they are rare and don't always meet the required demand. Also, Earth economy isn't based around precious metals and though precious metals are used, they are mostly used as jewellery or investments.
So, adding a few kilos in the exchange system isn't going to cause issue to the market (but might cause legal issues like the source), because, firstly MC isn't selling them directly in bulk but rather converting them to jewellery because of which the amount getting released is low. Secondly, since its a jewellery, people won't be selling those away immediately after purchase and they would actually enter the market at a lot slower pace (its not like all the jewellery's that MC would sell would all be immediately resold away by the purchaser and even if some do sell them, there would be a time gap, so at most only a few grams/ounces would actually enter the market at a given time).
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Harry_Dong: Well MC would have to sell those at a lower price though to avoid possible legal issues, because while self-farming for gold or any precious metals
shouldn't be illegal, the unauthorized sale without any known source could be illegal. And technically, MC wouldn't lose much anyway even if he undercharge somewhat, because he self-farmed the metals and used magic to craft them (so acquisition cost and crafting cost should be much lower than normal in his case).