Serious Question: Why doesn't Niantic add more Pokestops?

I live far away from any Pokestops. The pricing model is no secret: Hit a wall, pay to keep moving forward.

I hit the frustration wall at level 2. Level. Freaking. 2. I found myself playing the game here and there when I was around Pokestops.

I would have spent at least $100 on this game if I could walk in my own neighborhood and hit Pokestops up. I would've bought incubators, incenses, lucky eggs, and storage upgrades.

This seems to be the same story for a lot of players. Friends have quit because they have to go way out of their way to play the game. I have absolutely no problem walking, running, biking, and traveling around... but I'd like to be able to start playing when I walk out the door, and not have to jump in my car or travel for 30 minutes by foot to begin playing.

My question: Wouldn't it be more profitable for Niantic to make the game playable in more places? I'd be paying a lot more into the game... a lot more.