When church is 30-60 people, your primary communication channel is word-of-mouth; you can get around to most people in a week, and the other will hear about it soon enough. Any ads up the front, or video-ads are purely secondary to that word-of-mouth.
When church is 120-200 people (and all the more as you grow), your primary communication channel is up-front ads, videos, etc. But what’s often forgotten is that word-of-mouth becomes a purely secondary method. What was once primary simply becomes unreliable.
It’s nice when it does happen, but you can’t rely on it.