Developers care.
We don't.
We have statistics of active players, if these start go down, we start to care(well, we do care about the communities of our games, but we don't care about "I quit" posters, they never quit anyway, yes, we can check that effortlessly).
"I quit" posts are included in community mood reports only if half of the forum is suddenly full with them.
Single one is as much of a reason to laugh for as as it is for fellow players laughing at you atm.