I have made 4 extensions in the last 1 year, with over 1000 users.
- 1 over 100,000
- 1 over 10,000
- 1 over 5,000
- 1 over 1000
Only marketing was a single post on Reddit for each.
Getting a featured badge is a must for organic growth on the chrome store. Without it, you're screwed.
I have other extensions hovering around ~100 users that don't grow as they don't have a featured badge.