I think the people that sold early are regretting it now.
Which people? You can't sell it yet. That's the whole problem.
The entire transaction volume is less than 500 BCH. I don't know how many early adopters hold more than that, but I know there are a lot of peole eagerly anticipating to sell their stake.
The people that had BTC on the exchanges like Kraken before the split. I believe a few exchanges issues IOU BCH tokens. So, those people were able to buy and sell.