Don't buy it since you don't know if you need one, all these pi's and mini pc's are aimed at teaching basic computer science. It's a must have If you are a DIY'er or like tinkering with stuff or just want to learn how to program.
As for the uses they have a very active community and people keep coming up with weird projects all the time, just look up Raspberri Pi or Banana Pi projects.
If nothing you can use it as a cheap media centre or a retro gaming machine -
http://blog.petrockblock.com/retropie/
If you still wanna see what the deal is wait a bit until this is available locally, hopefully the prices will be low here as well.
https://www.raspberrypi.org/blog/raspberry-pi-zero/