I just read an interesting journal entry about essentially holding a boycott.
The fallacy I see with this is that people are arguing that Slashdot is trying to resell the content that people are providing. Slashdot is more of a community forum than a bona-fide news source. They don't have reporters, don't create news articles, etc.
Slashdot is just proposing a way for people to pay to be able to participate in this community.