To be honest if you're a student past the age of 21 then it's your own personal choice. You've got to draw the line somewhere otherwise what's next, discounts for people on jobseekers allowance or means testing to see how much you can afford?
As has been said, £85 a month isn't that much if you haven't got kids and a mortgage, just cut back on something else or get another job.
How dare people choose to better themselves eh?