Black Hat Hackers, ISPs, evil governments, script kiddies, etc. get bored easily, and when they’re bored, they’re starting to look for things to play with. And a network with several million connected users is certainly an interesting thing to play with. Some of them might start intercepting the data on the network or do other nasty things with the packets that they can get.
If these packets are encrypted, messing with them is much harder (but not impossible! – see the end of this article). So you want your packets to be always encrypted. And the best way to do that is by using a VPN.
Of course, if your VPN server is located in some unsafe place, this guide won't magically save you from all bad things. So make sure to get a good server first.