this is for 'business class' service, which is often in office buildings. metro fiber and ethernet is really, really, really expensive in these buildings because of other monopoly factors - the cable companies wish they could compete here, but they sometimes can't.

for example, symmetrical 10mbps metro ethernet is close to $2k/month here in LA. yes, for real.

commercial service has higher SLA's (which really doesn't mean a damn thing, it's just tradition) and is more expensive.

it's highly dependent on your office building's location. cable companies and fiber operators do not canvas entire commercial districts like they do residential areas.