To put this in some global perspective... Alibaba's one day sales event "Singles Day" last November grossed almost half that amount (i.e. $30B). Note: Alibaba's operating margins are approx. 30%.
I assume a lot of that Alibaba volume is them collecting smaller commission amounts on a larger number of transactions? Would be interesting to know what the gross profit margin is on their revenue figure for the day.
eBay for example did $94b in gross merchandise volume in 2018, their revenue was $10.7b.