That's wrong, you are taking ideal numbers, it never will be like that in practice. Also, try to put all the hardware together, make it work and try to get those numbers you are claiming... You won't get those numbers... BTW, Difficult level goes up every day.
If it's that easy as you say, go ahead, escalate x 100 what you are saying and you will be rich. You know very well it won't work like that.
It's very easy to say things, but then in practice its a complete different story.
With luck, with a 7770 Card, you can get this:
per Month ฿0.40 $46.03.
Just build a blog in adult, promote a program, and you will make that only from the blog without wasting all that energy in vain.
Submit an article in mainstream, to 20 article directories, and you will make 3 times that, after 30 minutes of work.