There is another thing to consider

Just becuase there are a lot of properties on one road and not so many on another don't assume you won't get so much out of it
You can never assume what people like to spend their money on
You can go to a road where there would appear to be plenty of disposable income and get nothing
but a more modest area would yield more

Generally speaking council blocks and housing associations are
a. not done by distributors and
b. don't yield very much as a rule
but you can never tell

some people like to spend their money on cars and televisions
others like beer and meals out
some like cream cakes and others buy teddy bears

I used to work in the Greeting Card industry years ago and it was well known that the people with least income spend the most on cards and associated gifts
Those with high incomes spent on schooling and property