I can see that some members here make some money getting paid to post in forums. I have been paid often to do the same thing. I have also won a few posting contests. Here, I am not saying that I am a qualified expert on forum posting. I just want to share my experience.
That's right. You can increase your post count without being banned and stay in the good books of the forum owners as well. Please note that this is definitely not about how to increase your post count by contributing fluff or posting trash. Here goes...
Tip #1 Don't just say thank you.
Consider this scenario. You post a picture of yourself. Someone says that you look good in your picture. You say "Thank you". So what does the other person say? "Thank you, too"? See what I am getting at?
When you post a simple "Thank you", you are being polite, but that's it. You are not adding anything much to the forum content. You are not even making a real effort to increase your post count the correct way. What you should say should be something like this:
"Thank you. Do you think I would have looked better if I put on some purple lipstick?"
Now this response invites replies. And you can respond to the replies. Viola! Your post count increases. You have added some interesting content to the forum. You are happy. The forum owner is happy.