Just where are these 726,275 hams? have you listened to the 2 meter and 440 repeaters lately? Dead. What about the HF bands, especially during the day.
20, 17, 15, 12, and 10 meters SSB and CW are generally active during the day.
Isn't the average ham near or at retirement age?
No statistics to verify age spread.
Why not more daytime activity?
People work and see above(20, 17, 15, 12, 10 meters)
On many evenings you can tune 20, 30, 40 Khz on 80 and hear nothing but international data signals.
Maybe many amateurs think that 80 meters sucks for interesting or rewarding contacts.
Thirty years ago you couldn't find a place to park. Seems like the only thing that brings them out are the weekend corn-tests.
Contests can be fun and challenging for many amateurs and can take the edge off of the everyday somewhat typical boring contacts.