A few days ago on here, someone was claiming to calculate the income of a 5830, and he calmly stated what a months' income would be -- based on 877K difficulty!

(Newsflash, bro: that difficulty level expires in LESS THAN TWO DAYS! Sorry to burst your bubble)

So you won't get more than 2 days income at this difficulty -- and then you can't count on 1.3M difficulty either, because that will only last 8 or 9 days...

Those monthly income projections are so stupid. That's why you have people wanting to sell/return their mining hardware -- when reality comes a-calling.