I guess if someone were to just happen to have a lot of hardware already installed and at their disposal it would seem smart to put it to good use. But it seems to me in the end it's just a rich man's game. If I had disposable income I would probably play around with it like this I suppose - it would be fun!
And there you go, you did enough research to come to the conclusion most people don't realize till after they make hardware purchases lol
You broke down numbers really good but I think there is just too many variables that would fuck up anyones guesses on how things will be over the next six months.