On one hand I totally get why people don't want to be tracked (I don't). On the other hand, for many of these sites, this is their only source of revenue.
Whenever I ask, "is it ok for those sites to block you if you are running adblock" usually people say "no, they need to find a different business model!". But my question back is always: until they do find a new business model, if they can survive by blocking people who use adblock, why shouldn't they?