People will discover Monero from word-of-mouth, blog posts, articles, comments etc. From services (like DNM's) accepting new payment options, and so on.  Soon the whole userbase of Oasis and AlphaBay will be greeted with a safer way for them to transact. This type of marketing is the most powerful available.

Sure you can reach 100k people in 24h with internet marketing, but out of those you would be lucky if 10 dig deeper into the subject. 99% of the viewers are average joe people that don't give a fuck about investing or why anonymity is good.