There are two categories.
One is teams that are tanking (don't promote so they keep their stars and a high quality)
The other is teams who have a low quality (4*-5*) players and keep them that way so to have easier opponents in asso draws.

In both cases the teams aren't interesting for the League, just to win the asso cup, the tokens, a high ranking, a show off in local (or not) fb groups
Usually this team is the reserves of a manager.