otoh, who said it is safe? The company releasing a card with crappy cooler and wants to sell hardware? It's up to the end user to determine if he wants to keep at 95ºC a piece of hardware that costs him $550.
900 Kh/s at 270w is indeed decent. What is not is getting 900 Kh/s at 270W after paying $550. Compare with getting 750 Kh/s at $275 and ~180W out of the 280x or 650 Kh/s for $200 out of the 7950.

Here's my take:

Look at the exchanges we use to trade stocks.

Now look at crypto currency exchanges.

Notice the difference? Would lag and downtime be acceptable?

I think in the next 5 years etrade or tdameritrade will get into cryptos. when that happens and everyone is talking about crypto coins like the they did back in 1999 pre-internet bubble days...it will go ballistic as everyone will be wanting to invest in it.

Could very easily go 100k when that happens.

I think it will go 5-10k in 2014 before any of that happens as more people find out about it and start buying. That's not to say there won't be boom or bust cycles...but the long trend is always up.