Well you want to complete the thought that the verse is beating around the bush about or you want to shout out something that will attach itself to the listeners mind and the more times you can repeat a simple hypnotic phrase the better the chance this will stick in peoples minds (see Foo Fighters). You see it's a marketing trick. Everything is these days. If you can get something stuck in someones head, hopefully they will be hypnotized to buy. The other thing that can happen is you can drive them crazy with the repetition and they will avoid your song so they don't have to hear it.
So your chorus partially depends on your artistic integrity, your attitude toward marketing, or your passion to just rock out.
A few of my better songs don't even have a chorus. Sometimes vs. ch. vs. formula just gets too predictable. So do what you do and listen to it over and over. If you can imagine playing it night after night for people with a smile then you might have a good chorus/song. Or you might be insane.
