Interesting, I don't really know how that works, DAO is built into Ethereum, people have to exchange ETH to get DAO. How can they then sell DAO for BTC or Fiat?
Doesn't that mean there is less ETH in circulation, it is essentially burned when the sale is made.
Because the DAO was already purchased with Ethers...
1) Think of it as just buying a product in a store.
2) You buy that product with USD's, Euro, or whatever fiat.
3) You can sell or trade that product, for whatever you like (other products, Bitcoins, Paypal, etc).
So translated to DAO's:
1) DAO's were put up for sale. They could only be purchased with Ether.
2) You bought some DAO's with your Ether. Now, your Ehter's spend, and those DAO's are yours.
3) You can trade these DAO's for Bitcoins, back to Ether again, fiat, etc.