High'n Fast... I am a spotter but do not agree with you. Many airfields have their own "spotter" site, which are far more comprehensive than anything on here. There are spotter sites for just about every imaginable aircraft movement, civil, militray, overflying, etc., many of which break the law by publicising R/T conversations and revealing classified information.
PPruNe is a respected site for professional aviation personnel and this particular forum is for people to "discuss issues about the job". I would hardly expect professional users to want it to be littered with lists of airfield movements which are freely available elsewhere.