If the tactic results in a return on investment, somebody will do it -- even if it makes them unwelcome at family reunions. When the cost is extremely low -- s

If the tactic results in a return on investment, somebody will do it -- even if it makes them unwelcome at family reunions. When the cost is extremely low -- spamming -- any return at all will justify it. When the cost is low and the return is relatively high -- cold calling -- it will happen. Only regulation and good enforcement of the regulation can stop these activities in a capitalist regime.