10 miners! That's quite a rig there!
5 months ago 1 of my Jupiters made 1 BTC per day. Now it does merely 0.085 BTC per day. That means that now I make 8.5% with the very same hardware. Crazy! Difficulty raised so much that just thinking about it is breathtaking.
With current difficulty, my Jupiter makes 14*0.085 = 1.19 BTC. Or assuming another 20% bi-weekly difficulty increase, 2 BTC for the next month.
At current prices ($580 per BTC), that is $ 1160, minus $100 to pay electricity.

So 1 Jupiter still makes quite a bit of money. I will make over thousand bucks next month! Per Jupiter! That is the reason I am still so optimistic and eagerly waiting my next generation miners (Neptunes), and I see difficulty raising as an opportunity to be one of the last standing, once bitcoin mining becomes a stable, low income, low risk business, by the end of this year (according to my calculations).
I dont pretend to reach ROI within a month. Within 6-12 months will work for me, and after that it will be just a second salary. According to my calculations, a stable monthly $500-800 per Neptune (after paying electricity).