Tyrion, I'm not sure what you're misunderstanding here, but your calculation is completely superfluous. The only thing you showed is the overall difference that having merchant makes, which should be quite easy to know based on my calculation alone. You're simply saying the same thing that has been said several times in this thread, which I have already responded to: it doesn't give a no-lifer who is able to demand perfectly every five minutes from all his farming villages manually any advantage.
Oh, and about the mines, any lower level mines will only mean a great increase in income due to demands, so in that sense it's not "favourable" to my calculation to have higher mines. It only made sense, though, given that a player with all farming villages fully upgraded would certainly have all mines fully upgraded as well. I'm not sure what you mean about people being sim city players if they have fully upgraded mines - you get your city upgraded quite quickly, and it pays off for anyone, regardless of their playing style, to upgrade mines fully.
Edit: Apparently, I misread a very important line in your post where you claim there is a daily limit to the amount of resources you can get from farming villages. This is new to me. I have farmed for most part of a day before with 5-minute demands, and never stopped getting resources. Do you have anything that evidences this limit? If there is such a limit, then those with the premium farming feature will still have a very significant advantage, but now we can exclude the most active players from the equation as well, not just the no-lifers.