It's possible to only pay the lower end of that range for a 2Gb 90th percentile commit on a 10Gb connection out of most major markets. Cogent pricing fluctuates wildly depending on your ability to negotiate.
Ignore the whole song and dance when they have to bring in a VP into the call to specially approve the pricing they're trying to pitch to you at. Those are standard transit sales tactics. Or avoid Cogent's sales entirely by working with a reseller.