I would imagine they are aware of a 20,000 member forum that idolizes their game, but at the same time, don't expect them to listen to every request. Some things are outlandish or not possible (car wish lists come immediately to mind, as do ideas that stray too far from the goal of a game), and even if they read about it, there's no guarantee that it will be included. Also, there are other forums besides us (even if we are one of the largest). Bug reports and common errors/compatibility complaints are no doubt taken into consideration from anywhere they happen to see, but not every thread is read over (threads about NFS games, for example, where people sometimes give tips about other games, are probably not looked at as much as "Running on XP 64 - Crash to Desktop?").
Put simply - yes, they listen, but it doesn't mean they're going to obey our every word.
-Leadfoot