Exchanges can of course stake as everyone with an online and unlocked wallet - they would be fools to do so though as people could see that they don't use cold wallets.

I was finding 1-2 blocks a day with my 7k wallet like clockwork (even 3 one day) so yeah I can do better trading but I don't have everything on exchanges (as that would be stupid) So I love a good staking fast sending coin to store $ on and have it grow. and since BLK has a set rate of 1.5 per block (739,631 as stated) the rate at which the supply grows is technically a smaller % of the total supply each year    which is good in the longrun. I think BLK has great fundamentals as a currency and has managed to stay on Polo and Trex this long... lol not many coins from back then can say that, I'd love to see it added to that new Canadian EZbtc exchange as they are about to host Altcoin - BTC trading.

  Indeed this is an interesting time in the Crypto-verse as it's growing at what seems to be an exponential rate. Older coins like BLK that have had stable blockchains for years will find lots of new opportunity.