> Whitelisting is free for all small- and medium websites and blogs. However, managing this list requires significant effort on our side and this task cannot be completely taken over by volunteers as it happens with common filter lists. That's why we are being paid by some larger properties that serve non-intrusive advertisements that want to participate in the Acceptable Ads initiative.
It doesn't indicate what the percentage is, so it's unclear where the commenter got their number from. It'd be interesting to know the exact details though.
However, I'm not sure why, but I really don't like the tone of the Adblock Plus team, in this post. It kinda looks like extortion.