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I wonder how many precancels are simply discarded by the unaware.
Very true! The thing about collecting precancel collecting is that the focus becomes the overprint (precancel) of the stamp and NOT on the stamp itself.
Precancels by their very nature are almost always on common stamps because precancels were intended to be used in quantity, typically on mass mailings.
The challenge is to find that special overprint. In some of the larger cities, there can be as many as 75 different precancels for one city. It's not just the name of the city that's important, but the specific precancel type for a given city or town that is highly sought after. Some precancels aren't worth pocket change; others are worth hundreds or even thousands of dollars. I believe the ones shown above would be on the upper end of that scale.