Some people block ads because they don't like the tracking that comes with it.
When asked to add a site to the whitelist to support it the downside is that you will be tracked.
Why? It isn't an ad. Most users block ads because they find ads annoying, not because of script bloat.
I use uBo for performance and battery savings
I would definitely block it, simply because the browser isn't the only application running on my computer.
Aren't we blocking ads to cut websites's revenue streams?
I don't know about everybody else but script bloat, and its implications for performance in generally and scrolling smoothness in particular, are the main reason that I block ads - the visual distraction is a secondary factor.
Yeah you can be sure as shit I'm going to avoid any site that plans on thrashing my CPU.