You are getting $6-$7 per day at only 130w per card. $525 per card and $6 a day and lets say $0.1 kwh (im taking high electricity cost and only $6 a day) would mean you net 5.7 a day meaning you recover cost in less than 90 days (88 days)...
I would say fair deal.
I don't think $0.1 kwh is on the high side. If anything its on the low side for the US market. I remember reading somewhere the average in the US is 0.13/kwh for normal usage amounts, unless you are in a lucky state like Washington (ridiculously low kwh price there). People here in California $0.2/kwh is the low side up to $0.35/kwh on the high side. When mining you well exceed the "normal" usage amounts and bump up into the higher tier brackets for power costs. Just my 2 cents. So far the 470's/570's are still a better deal at only 90w with bios mod unless you can get a vega at a good price (sub $400)