Its called difficulty. The networks are all growing in a big way. meanwhile BTC has taken a nosedive. 675$ is not really much considering it was at 8-9 for a while.
I understand difficulty, but I highly doubt the difficultly jumped 3x since early feb, to produce the 1/3 of the profits per mhs on everything. I looked at litecoins difficulty just now, and it hasn't even reached where it was at (it is close though, but that is because people/pools are hitting litecoin since the altcoins are blowing (i'm assuming.)
If it was a few months or asics were pouring out i'd understand if the difficulty increased that much.
Something just doesn't add up.
edit to quote fix hopefully lol
