I think the reason that there are initially limits to posting on the forum (besides weeding out spammers, etc.) is to encourage newer users to, for example, use the forum search function first to see if their questions have already been asked, answered, or discussed on other threads in the Forum. This helps reduce repetitive discussions and keep topics more coherent and consolidated.
Slowing down a bit within a topic also gives more participants a chance to put some thought into their contributions to the discussion without feeling rushed.
To reduce the number of posts that the system “sees,” you are also encouraged to consolidate responses to different people into a single post, using the quoting function to show what you are responding to, like this for example:
Just put your cursor where you want the quote to appear in your post, then highlight the part of another post that you want to quote, then click the quotation mark tool at the top of your draft post to insert the quote.
Hope that helps…
[EDIT: another way to reduce post numbers, if you just want to acknowledge or say “thank you” for a response, is to use the on the response instead of adding a reply.]