Coinbase added 1 million users for the past month. And the total number of users now is about 8.5 million from 5 million on December 2016 (70% increment !! for only 7 months).
The reason for that is the appealing bitcoin price that flourished the past year from 1000$ to 3000$.
And this encourage more users to join the cryptocurrency world.
Then How much should the one own?