I'm quite happy to admit that I could be described as being a member of the parasitic rentier class given that I do indeed live off unearned investment income, I do however certainly pay tax still, in many, many different ways that you obviously don't understand.. it doesn't mean I'd like to see the situation change, especially for those who benefit from it FAR more than I do or ever could.
I still don't understand why you find it so unbelievable that living off not much more than £100 a week is possible, but I suppose not everyone can be financially competent and responsible.