Just for traffic / out of interest, following an offline discussion with someone.
Do you think someone who is a full-time student but also brings in a very good wage (say, £50K-£60K, a mature student still working in their previous profession) should be entitled to claim student exemption from the council tax (around £2K, they are a homeowner)?
YABU - no, this is a measure designed for young people with pocket money wages and rented shared households, this student is an atypical case and should not exploit this opportunity.
YANBU - they are legally entitled to it due to being a student, and there's nothing morally wrong with it.