Like anything else, it's location that makes a difference. A night at Hampton Inn in the greater Chicago area is more expensive than a night at a Hampton Inn in Oklahoma City.
Competition is fierce on I-40 in OKC. There are a dozen hotels at each exit. Not true in Chicago.
My travel tends to be away from major cities, so I don't think I've ever paid more than $70/night.
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"I will not be pushed, filed, stamped, indexed, briefed, debriefed or numbered. My life is my own."