Blame technology.
...without smartphones, girls would be lining up every street in the downtown core. They probably make more off webcamming for digital rupees from 2nd or 3rd worlders than they would competing for a piece of a street corner. Only other hope is the off chance you run into someone 'that' desperate they need cash now for their hourly fix... or their antibiotics.
Being glib put aside, it's just the sign of the times... it's more effective to sift through all the scams in various classifieds websites while at home, then wasting a tank of gas zig-zagging through the downtown core, from Leon, Lawrence, Bernard, and Doyle... and hoping a trashy looking girl is open for business, it's a total crapshoot these days.