Once you don't have staff responsibilities bringing you back every day, it doesn't take long before real life responsibilities take over your time and then little by little you show up here a lot less often, and then even less often, and then only when some other staff member emails you to come and post for some special occasion, and then you stick around for a bit because you miss the place because it's so awesome, and then again you start to fall back to your real life responsibilities, and then the cycle repeats.
Edit: What happened to the Former Staff rank?