here's another real-world example of a sustainable vs unsustainable approach to advertising yourself:

Let's say you've written a ton of songs, and you want to market them. The unsustainable approach would be to pay for advertising. Its not that advertising wouldn't help... but The minute you stop paying for ads, the benefit ends. And as long as you pay for the ads, unless you are selling enough songs to pay for them, it's a hole in the money bucket that drains funds.

But if you make music videos... and if you make it a point to put an ad at the end of each video, pointing people to your songs (or other service you want to sell)...

... those ads will stay online indefinitely, and not cost you a cent. It's easy to sustain an ad campaign that doesn't cost you anything. All the better if you are able to create videos that go viral!

If ads in videos didn't work, Youtube wouldn't be doing it.

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0