That's the product of L.A.'s ill-advised TAP fare system, where one must TAP in and out for each vehicle required to make a trip, greatly inflating the cost of travel. Since not everyone is going to or from downtown Los Angeles, Many (if they are in fact tapping in and out for each trip) are ending up paying double or triple the base fare....passengers will be able to travel across the county on single trains, eliminating two transfers and $3 a trip in extra fares.
It's a far cry from New York City's "one city one fare" policy, where the Metrocard allows time for transfers (either between subway lines or between subway & bus) and even multiple entries into the system where necessary under the same single base fare payment.