I joined ScubaBoard in 2004, and for the next nearly 15 years, I averaged nearly 5 posts a day. That was because I was very interested in the topics being discussed. I read about scuba and decompression theory extensively, and I felt I had a lot to say that would be helpful. It does not take long to make a post. You can do one in seconds. Posting 5 times a day takes no time at all.
In contrast, doing meaningful dives can take a very long time, and you can't just walk into your home office to do them. I have done dives lasting hours, and that does not include all the time necessary to prepare for the dive ahead of time and break down equipment after it.
Logically, then, a person who is very interested in scuba and enjoys participating in discussions will have many times more posts than dives, even if that person has a lot of dives. It makes perfect sense.
But for some reason, some people who lack the capacity for logical thought seem to think that having more posts than dives means you do not have the necessary background to make valuable comments. These people who lack the capacity for logical thought think it is clever to demean those whose avid interest in scuba and whose deep reading on the topic results in a high number of posts. They typically make asinine comments about "posting less and diving more," and they actually think that makes sense.