I only know one thing about emails: Emails - extremely cheap if compare with any other ads method. Extremely effective, good to scale and gives much more resul

I only know one thing about emails: Emails - extremely cheap if compare with any other ads method. Extremely effective, good to scale and gives much more results, that all known and tried ads networks with big budgets. What about the topic -> all of that info related to 90% of users. Most of normal casual users has one email, and all stuff mentioned in the topic. Very rare cases when something else. The list more about exceptions, instead of real life