I'm pretty sure the actual products on sale are not the only reason why Kensington market is constantly filled with people sitting on the curbs or generally milling about. If you replaced all of the hanging electrical wires, graffiti, dilapidated sheds, and poster-covered lampposts with sleek, spotless buildings, the market would quickly loose its appeal. Of course this is just my own opinion and I'm assuming that it is shared by many other people. I have no way to prove it. But if people really don't like the filthy aesthetic of Kensington market, they definitely show high tolerance of it when they go to buy random pieces of fruit or cheese.