There are still more than enough markets and people selling things on the streets all over.
ag, what you described put things into perspective. I agree that something totally uncontrolled could be bad - some sort of balance might work best. For example in Bangkok there is a conjested market of tourist-junk that has grown up around the wonderful old sex-center of Patpong, making it difficult to walk through and of course offering nothing any reasonable person would be interested in. Another prime sex-district of Bangkok is 'Nana', and happily there is less of this kind of junk-market there, however there is a thriving market of sidewalk food stalls and 'cafes' that has grown up since the absurd 1:00-2:00AM bar closing time was oppressively instituted.
Guess which of these is cracked down upon by the cops - obviously the late night restaurants, as they offer a venue for freelancers and farangs to come together after hours. For some reason governments never seem to care about the selling of worthless junk, but they cannot bear the selling of what all men want!