I used to think about the board the same way you do, then I realized that of the owners that are "web active" just a small percentage of them tinker with their cars, whether it be restoring, detailing or racing. When you estimate that small percentage, then the typical activity of this board makes sense.
AND! I've lost count of the number of newbies that buy a TTA and go all out for posting then disappear into the background after 6 months ....sooner than later their TTA's come up for sale.
very, very few like me, continue to hang around after we have sold our cars.....I just like it here....TTA owners are vastly different than a typical 3rd gen owner.