I was having a conversation with some of my old uni friends about this, and usually people seem to fall into one of 3 camps.
1) They don't watch TV at all (apart from Netflix), so don't need one, 2) they only use the TV is their accommodation's communal area, which is already covered by a TV licence, or 3) they aren't clear on the rules, so never bothered to get one.
I'm curious to know if any students who are avid TV watchers (or use catch-up services) actually bother to pay for one, as nearly £150 is no small amount for students to fork out.