I guess I have a problem in general with the idea of post count being related to credibility or knowledge.
There are definitely exceptions to that rule (nobody on this board or elsewhere is being implied here, just stating).
I could care less if my post count was -7 or 15,000. Makes absolutely no difference on a person's ability to think, be safe, answer questions, or otherwise.
All a higher post count does is allow others a larger basis to get to know somebody.
Some may use those posts for ambiguous attacks on others, or an entire group of people. Others apply posts sparingly but have good things to say, as a rule. Post count is largely irrelevant.
Too bad there couldn't be a statistic for "other posts actually read and considered". Or maybe "other posts completely ignored because I am the only correct person around here". Those would be interesting numbers.
Yes, the OP's question was answered quite well. I'm sorry if I started a fire I shouldn't have. (using the term "if" loosely)