It's certainly true that until the moneyed twats started invading about 3 years ago, it would be unheard of for anyone living in Brixton to spend £50 on a night out.
[cue predictable responses saying this is a predictable response, etc etc]
I used to spend a hundred gib on a Friday night quite easily in brixton even many years ago. Largely on shit coke tho it has to be said. One thing I really don't miss about the place.