It may sound logic to some, but I don't find it personally. To know if you're in profit compared to the ICO, you need to play with two values, Ethereum price at the moment you bought and now and the price of The DAO in BTC.
I also don't really get it. It was in internal swap on the ETH network, Ether for DAO.
Now people are trading DAO for BTC, does that mean that the DAO isn't really being moved on the ETH network, just the owners are passing the private keys around to each other?