Mostly because it's free. But it clearly has some value to me, mostly as an engine for figuring out what terms I _actually_ need to search Google for. And if th

Mostly because it's free. But it clearly has some value to me, mostly as an engine for figuring out what terms I _actually_ need to search Google for. And if they offered a tier closer to the amount of value I get from it, I'd probably pay that.