"They wanted to pay that CTO something like $50K."
Imagine you could comment on that job posting. Wouldn't it start a war of words since you obviously are upset with the salary posted for "CTO" (not saying that I agree with the amount but thats besides the point).
Now, let's say that you argued over comments that $50K for CTO is crap . What are the odds that the posters would change the value to $150K over that?
It's to prevent comments identifying companies that do not wish to be revealed. Also, it lets the founders making the more embarrassing postings be quietly and indirectly guided rather than letting them be mocked publicly (as many used to deserve, but the postings have generally been better in the last year. The system works.)