I don't block unless it's excessive spam. Informational disadvantage, yadda yadda.
I just exercise the same muscle I use to restrain myself from responding to bait on modern day Reddit, since my account there is still active but not posting (yes, even lurking is technically contribution, but there's too much useful information there for me to justify completely cutting it out).
And for the record, I disagree with block features removing posts from the user on the other end. Public information -> only I get to decide what I do and don't see. Private information -> only I get to decide what I do and don't share. A bit idealistic, but we're talking about a web forum here.