I will start with one to begin the discussion. If you are putting huge amounts at stake and want to keep identity private, online gamblign comes as a boon.
In addition to not being robbed midway to the bank or the house 
For me literally the advantage of having in an online casiro or gambling is the ability to play even when you are sitting ina toilet
This example made my day. Why should we lose precious minutes in the WC while we can make moneh 