Whut???????????
I would guess that the association pays for things like cutting the grass, maintenance for the outside structure, etc. They collect a regular fee from homeowners so that everyone shares the cost.
There may be fewer owners but the grass still needs to be cut, painting needs to be done, etc.
We’re having that problem where I live. Many bought condos here for investment purposes and now they’re going into foreclosure. They stopped paying HOA dues a long time ago. IT EFFECTS EVERYONE. We are in dire straits.