Why is staying logged into bank sites and other sites a bad idea? Technologically speaking how do people need to be near your wifi location to hack you when you do this?
WiFi isn't a secure technology, yet. You log in with WiFi, and you are in the midst of a hacker, your info can easily be stolen, or the hacker can easily do something malicious.
No one smart is stupid enough to log in while at a WiFi hotspot. And if you stay online at that bank site long enough, it makes the hacker's job
much easier. Because you're logged in, he can easily do malicious actions without having to log into your account. And leave no trace that HE hacked it. You can be blamed for doing the action yourself because
you left it logged in.
However, if you have a router (that has WiFi) at home, and you locked down the entire router, so that no one outside of your network can use it, you can log into any website and not worry about having to log out.