I'm mining with my three ATI 280's, since the start, so far only have 2.5 coins. Nearly 4 hours. I know 3 cards isn't much, but looks like I'll get 150 cins a day with just a signature in my post.
Not sure those ratios are great.
There is always balance between supply and demand. When we reach hundreds people.it will be very very very popular crypto coin.