I think your calculation is wrong.
This is my 3 x R9 270x and 46.49MH/s power i have.
Earning in last 24 hours 1.533089 ETH (dwarfpool)
earn $2 per card i think its not possible.
I did a test with a gtx 960 tweaked and managed 8.2mh/s over 6 hours on nanopool in claymore eth only. That is about .49 a day, and a 970 can do about 2.5 times that so maybe $1.20 a day? I believe the 970 can be tweaked to do about 24mh/s eth, however that's right at bricking them.
Speaking of Claymore... why not just dual mine ETH and sia or pasc? Seems that would be the best return when I check the calculations.