This is the phenomen which I can't grasp until now. We have all waiting for good DEEX or P2P exchanges.
People funded multiple ICO's with millions of USD only to get one running. Today there are multiple high-quality peer to peer exchanges and nobody is using them, to be honest. Why?
They are safer, there are almost no fees, for sure lower as on other exchanges, no KYC, no point of failure. And there is no volume on all of them.
I think a lot of people has a bad experience when they used the first exchange of such a type Etherdelta. We all know that it was a pain to use it. Was slow, there were no advanced orders and hall exchange was very limited.
Volume is the most important reason and plays as main barrier of decentralized exchanges. Investors and traders don't want to join exchanges (centralized or decentralized) that have low daily volume. Because they will have to struggle themselves with low daily liquidity on those exchanges when they want to buy or sell at expected price. People tend to like big-volumed exchanges, that give them as much convenience as possible for their daily tradings.