I am a member of a cinema projectionist board that explicitly tells its members to not make a fuss about leaving or reposting again. I haven't posted in that place for years now. Always felt a bit weird to me, that particular rule. I'd think that both cases are warranted, and if you value your membership you should be glad when people do decide to rejoin.
But, of course, the admin of that particular board was and remains a cunt.
Which doesn't mean that y'all need to care about me popping up again.