Re: I kinda like the idea of better targeted ads but on the other hand...
Targeted advertising doesn't scale to a network the size of the planet. For example, say you are looking for handmade greeting cards. If you go to your local boutique, you'll probably find some. No need for ads at all. If you search for them online, with no filters enabled you'll be inundated with ads for said cards from all over the world. The advertisers claim this is targeted because you were looking for the cards ... but from your perspective, you're getting spammed by a ton of junk from all over the world (who knew they made greeting cards out of chinesium‽‽‽) ... and the person you were sending the card to received it three weeks ago. You don't need or want any more, but still the ads come ... So if you are like my computer incompetent DearOldMum or computer illiterate GreatAunt, you find and install ad blockers out of sheer frustration over the barrage of shit.
"Currently, I only ever seem to be shown ads for stuff I'm not remotely interested in."
More likely, based on complaints of my users, it'll also be ads for things you have already bought and don't need any more of.