Except that affordability doesn't appear to be a central foundation of hipsterdom, "authenticity", on the other hand...
I suppose I should make it clear at this point that I see the various waves of settlement in Brixton and its environs as distinctly different, and that even during these waves, there have been other settlers who weren't motivated by anything other than a desire for a cheap family home, but the "hipster" influx...well, that's somewhat different, in that it's people riding a wave that started back in the '70s and '80s with the influx of squatters into empty properties left to rot after the plan to level central Brixton was abandoned. These are people, many of whom believe that you can purchase authenticity like I'd buy a tin of peas - consumption capitalists to a man and woman. They're not here because of low prices. Many are here because here is where they deem themselves as currently needing to be, to be "authentic" - to be real.