Assuming $10 billion to build, $20 million/yr to operate, 10,000 commuters (20,000 trips) per work day, and 30 year operations, the cost per passenger per ride will be approx $70 ($140 round trip).  This totals over $70,000 per commuter per year!

This doesn't include interest on the $10B upfront cost or unanticipated costs. The costs per commuter are eqivalent to a full year salary, or a new car, per commuter per year. Insane.