Virtual World Business has a very good and insightful post about freebies, and how vendors should best deal with the issue. From reading vendors' descriptions of jerks demanding freebies or complaining about the ones they get, I can't say I'd blame anyone for not giving them out, but I think the recommendations in the post make sense.
I make a point of doing business with makers of freebies I like. To do otherwise is to shoot myself in the foot. As Milton Friedman would say, I should communicate my desire for what they make via the communications medium the market understands: money.
Do read the post, and check out the blog in general.