i just did a simple calculation, about 35k bitcoins are traded on GDAX every day. At its current price of $6900 and a trading fee of 0.3%, the exchange puts about $700,000 in its pocket EACH DAY and it is ONLY for bitcoin. After including all other cryptos, this number can go up to more than $2MM. Since the exchange is active 365 days a year, the exchange's annual revenue can reach almost $1bn!!
it is just a fact. big exchanges is earning much profit by trading volume.
more volume = more fees. no wonder they can reward expensive cars in many events.
this is showing us that many peoples already using cryptocurrency for trading.