You are aware that there are people who use this forum that have physical disabilities, right? There are many, and there's a good chance that some will read this thread. Please have some perspective.
You are also aware that there are people with physical disabilities that have an active social life and partake in physical activities, right? It doesn't make any sense to even bring up people with physical difficulties using this forum, it's irrelevant. After all, barely anyone is going to use their physical disability as a reason for a high post count. What I saw in your post was a covert dig hidden within an apology. If that wasn't the case, then I'll accept I'm wrong, but there was no reason for you to bring up physical difficulties.
The reason people like J. Allen have high post counts is because they have been here nearly a decade and are actively social throughout the board in places such as Misc, TNZ and the lounges. Being social on the internet not only increases your post count but your eputation as a member of a community.