The March, 2011 of Hemmings Classic Car features a comet four-door (owned by Joseph Dagle), part of a set on original sedans. It's got good things to say about the 302 and Mercury build quality, and has a gem of a quote: "While it doesn't mean such a person doesn't exist, we've never met anyone with a burning desire for a 1973 Mercury Comet sedan". I'd say there are a few around these parts.