The better question is how much did you spend this week, Im pretty sure america has the worst transit system in the world.
It's pretty bad... Some cities have great transit.
New York, Chicago, D.C... Hell, even LA to some extent (If you are hanging out around the downtown area).
But the rest of the country is just so damn big.
Trains only run a few routes and it's a long haul between stops once you leave the east coast.
The north east corridor is the only decent train system in the US.
Flying is expensive for the common man. Much cheaper to get around in Europe and Japan.