1) Some people are actually, genuinely poor. They have to do their best to provide for themselves and others, and have no one else to rely on. To some working single mothers, for instance, £5-£15 extra spending money at Christmas could make a massive difference.
I will assume you are just immature rather than ignorant.
2) You know Prince Charles personally, eh? Pop over to his place for the weekend occasionally? Perhaps you share a holiday cottage together once a year? You must be pretty close if you have any idea what his bathroom habits are.