The fork did occur but many miners abandoned BCash coin right after it split from the main chain. The exit of the miners results to extremely delayed block creation due to the pre-calcuated difficulty and as a result no transactions with BCash can go through. Overall it fails as a currency, but does decently well on exchanges in spite of the inability to deposit.
But I see some exchange that can already do trade Bch, they have a value of about 25% of the current bitcoin price. Indeed I'm not sure this can last long, but this is our chance to take advantage. For forking I think this works because it has created bch, this impact of the split that occurs in bitcoin.