I'm currently doing this right now with 30 instances. I'm currently operating at about 7 MH/s. At current rates, it's not exactly "profitable", but I'm using up some AWS credit that I have. I don't intend to sell the LTC until it hits about 40 or maybe 50, but in any case, it's still all profit for me, other than the fact that I lose out on the AWS credit for other uses.
Edit: I'm also not paying $6/hr... That would be absurd. I'm not unprofitable by much.
Edit: I'm also not paying $6/hr... That would be absurd. I'm not unprofitable by much.