A bit of a contradiction here, for many of us one of the key way we decide on the validity of an OPs claims is not really by an individual post but by an assessment of the relevance of their personal experience. That assessment would be heavily influenced for most people by a build up of credibility (or otherwise) based on our previous experience with that individual.I think all should be treated equally on one platform, regardless of how many posts the member has.
As MT said, this is where personal experience as frequent flyer comes into play and each reader can decide for themselves if the OP has valid claims.
It's all very well to pose a theoretical "all should be treated equally" but this flies in the face of all we know based on empirical evidence of how human beings actually behave.