I think about spaced repetition forgetting curves for marketing/branding absolutely all of the time. 

Did you just launch? You need to get in front of people again at 2, 7, 30 and 60 days later if you don't want to be forgotten. 

This is the stuff brands are built on.

most of emails I get these days come from those kind of brands

I don’t care about any particular brand and it’s even off putting

If the product isn’t helping me with a particular problem, no amount of showing up in my face will help

product design at /basedstudio • exploring better ways to live: health, wealth, identity, states and more • bento.me/mxd

Ends up being a game of launching products, getting VC money, spending those millions on showing up at people’s faces for a chance for them to become loyal to you and have a working strategy to grow the number of those people and keep investors hooked etc. etc.