[pconf]

>This sort of vague comment

Not sure about "vague comment"s but anyone who has run an email server, used an rbl/rhsbl, and followed the logs <http://www.postconf.com/docs/spamrep/> would say the same. Having done so for years and run reports on dozens of servers daily it is clear that blacklists are the most effective form of spam blocking, by at least an order of magnitude.

[ScottWhigham]

I can't tell whether you agree with the OP or with my comment. Your first sentence argues that OP is right - "IP blacklists are a waste of everyone's time". Your second sentence though is "it is clear that blacklists are the most effective form of spam blocking, by at least an order of magnitude." Maybe a typo in your reply?

[pconf]

> Maybe a typo

Could be a bug in your web browser. The first sentence is a quote as indicated by the ">" character at the beginning of the line.

[ScottWhigham]

Could be a bug in your web browser.

I got that part, I'm talking about your first sentence.

... anyone who has run an email server... would say the same.

This reads as though you agree that "IP blacklists are a waste of everyone's time" as OP said. And maybe you do (and that's fine) - I'm just unclear given your second sentence.