A leech because we want to explore the internet without unsolicited ads? A user may be interested in exploring a sites content only to be exposed to unsolicited (and importantly here, unannounced) advertising. Seems to me like adblocker is a great service

Just because you make money from ads doesn't mean it's the only way for "society" to grow fruitfully, in fact I'd argue that it is unnecessary (though heavily relied upon because it is an option). That advertising provides disproportionate support to aspects of society that I don't want to support, and would otherwise perish or wither due to lack of social recognition and discussion

Wife sold tail