You have to undertand how big Tezos is. The small tokens and coins have to pay to exchanges to be listed. With the massive interest in Tezos all exchanges will list Tezos. In the future you can expect Tezos on Tier1 exchanges. We are still in BETA. When the mainnet launches the listings will come.

I mean, how stupid would you be not to list Tezos on your exchange, considering the money you make from deposits, withdrawals and trade fees?

XTZ is the future