I'm not a single-stock buyer, but am a huge Nintendo fan. Even with the surge recently, Nintendo stock is only now back to the levels it traded at when it first announced it was getting into the mobile scene & it's well off its highs from the Wii & DS era of '06-'09, so I wouldn't be shocked if went higher from here. It's also worth noting that Nintendo owns 33% of the Pokemon Company and is also a big investor in Niantic, so it's not entirely accurate to say they only earn 10 cents of every dollar spent on Pokemon Go.
They have 2 big IP coming to mobile later this year (Animal Crossing & Fire Emblem), a mini-NES this November that's been getting huge buzz on social media since they announced it yesterday morning, and a wild card with its NX system in March 2017. If you have a 'fun money' account, it might be worth taking a flyer on it.