To spend the money/power/resources to earn a few extra million Karma doesn't add up, IMHO.
You don't need 51% to do a successful attack on KGW.
We will bring something new on the table soon.
Yes, I am just saying you don't need to buy a lot of hash power to perform the attack. at 3Gh/s you only need 122Mh/s. At 1.3Gh/s it drops to 53Mh/s.
You only need enough nodes to confirm the transaction with enough confidence to fool the exchange, correct?
I am not really sure. You can read about it here:
https://bitcointalk.org/index.php?topic=552895.msg6021008#msg6021008