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Sidewall max on these tires is 52, i believe. Toyo Proxes RA-1 (they make other proxes, be sure to check RA1 specifically). So it is half way between "vehicle recommended for driving on the streets" and "maximum rated safe pressure for the designed load of the tire". It is not an extreme point.
Now, here's something that may validate your points a little. I am using 42 PSI to combat sidewall wear because I turn as hard as I can on the race track. Hypermilers typically also turn very hard on the streets to maintain momentum. This could be the cause of the rather even tire wear experienced by some. The same overinflation by someone that does not corner hard would result in a more center-biased wear pattern.
Using the more racey tires that have "optimal" tread wear around 30, i also have a LOT of negative camber (2.8*) which allows me to corner hard and keep the pressures down.
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