18 Advanced Techniques to Virally Supercharge Your Opt-In Signups & Skyrocket Your List without Breaking the Bank - If You Had the Chance- Right Now- Would You Trade One Night at the Movies For a Flood of Hungry Traffic & Opt-in Subscribers? The #1 source of income and profits for Internet marketers is their opt-in list of subscribers. It's not flashy web pages. It's not new, innovative products. And it's not mass advertising all over the Web. Experts estimate that 95% of all Money made online is generated from opt-in lists of subscribers.