Some members have had their MBs "change hands" so they no longer need to visit this site...or at least not quite so often.
Others as previously stated have just gotten pretty busy. Relocations, travel, etc.
And yeah, with the harsh tone that some of these threads have taken as of late, some just choose to peruse the posts, but not interject, lest they become a unwitting target of personal e-mail "flames".
As for me, I have more than one workstation up at any time, so I can post and peruse at my leisure...even when busy!
Weekends are another matter...quality time with the family, so I'm usually dormant as far as this site goes...