How would you monetize these? Mostly from just adding Adsense to the page? [For example, I'm looking at the geolocation of #hate/#love tags, and the imbored-counter.]
That works. In my experience, 1k visitors = $1. If you want $100/month, that's $3/day = 3k visitors/day. Not impossible to get with something catchy/popular. Make four of these and you hit your goal. It's not easy but it's not impossible either.
Please, there is something called niche and keywords in Adsense.
I have had a website in the barcode niche and the click was as high as $5-$7 with a 2-3% conversion ratio. That's like $15/100 visitors only and yes I was making that much.
You can check the PPC in adwords for scanner tools, it's exteremly high.