Well, before they can buy bc they need to take the shitcoin and trade it for btc then to bc incurring 2 trading fees. It makes more sense to mine with a multipool that mines shitcoins for btc, then you get a choice whether/when to buy bc. I think the idea was stupid from the beginning, not sure how to explain the enthusiasm shown by the current pump.
The whales aren't done yet pumping. I keep watching the top BC wallets grow and shrink buy millions of coins each day. One wallet grows to 4 million BC, then drops to drops to 1.5 million. Later in the day it is back at 3 million. The link below is the blockchain explorer for the top 100 wallets.
http://agran.net/bc_getbalance.php?top=100Don't get your hopes up, this is probably just the exchange moving between hot and cold wallets. Most of the top balances are probably exchange wallets. Each exchange can have any number of wallets really.