You need more posts to become a senior member, as per request from PID.
It was a good request.
And clearly, on some people it is well deserved... Complaining that you're no longer a Senior Member, and want your own title shows that you have a lower level of maturity than a single title insinuates.
Plus Stonewall - You may have been here for longer, but PID has proved his worth and shown his skill in judgement. And he's older than you.