I don't mind fighting and dying but knowing there is a very active player out there who frequently full sacs means I'm playing less. I think it is an incredibly assholish thing to do regardless of the reasoning IC or OOC. This is just my personal opinion on the matter and I'm not saying it is right.
So I'm choosing not to log in when they're on for two reasons:
a) I have very limited game time and I don't want to spend most of it re-gearing, that's not fun.
b) I'm partially doing it out of spite to minimise their kills, charges and fun. I know this is childish and they may not even care, but I simply don't want to play with people like that.