I don't know, but to me it just doesn't seem logical. Sure Hillary only had 50 counties, but it happened that in these 50 counties, there are more people than in the 101010 remaining ones. In that sense, Hillary won.
The vote is supposed to (in my opinion) represent the people, and not the counties. More counties does not necessarily mean more people. The people should decide the vote, not a county.
In the end it all comes down that at the moment it makes (more or less) sense to have the system like it is right now. But in my opinion the states are too separated. They act almost like independent countries, but when you look at it closer, they are not. It is very weird.