I did some calculations on them and they do not at all make sense to produce, since their selling price to NPCs is not much more than half the actual production costs. As an example: Currently, there are a lot of monitors on the player market for around 1,300 - 1,500c. However, the sales price (in stats) to NPCs is around 750 in France/Turkey and even only 633 in Germany.
Bearing in mind that you could sell the "ingredients" individually for a high price at the market, it makes no sense to produce them yourself for making some kind of pseudo "profit" on Monitors.
This is somehow a major flaw in the game mechanics. Now, the next thought I had was: ok, maybe there is oversupply. Bu no, the demand is not even covered by 5%. So how can that be?
Sorry for the "noob" question

Soc