How Much Money is Lost by “Forgetful Conductors” ?

I have written in this blog about the primitive and cost ineffective ways of collecting fares on commuter railraods,  Today I went to a professional meeting at Rutgers in New Brunswick.  I used my monthly ticket for the portion of my ride from NYC to Newark.  At that point I took out my ticket from Newark to New Brunswick.  The train was not crowded, but the conductor did not come aaround after the train passed Newark,  On a number of occasions when Karen and Lee went to NJ Devils games the conductors did not collect tickets.  How much money is lost this way?  Can’t NJ Transit, MetroNorth, and the Long Island Railroad modernize fare collection?