more often than not, posts have been purged to tidy up the site, General Off topic and alot of crap is removed, hence post count goes down.
 
I think I added a section to OTC, so that'll have purged. PLus I did purge the meets section too
 
its no compitition but i wondered why i lost loads of posts! think it was 200+ posts! but if the meet section and videos have been pruned that would exsplain it :D