Would some kind of a pick system not be more inviting or rewarding? Each player can pick 1 map that is their "map pick". Every 5th game you play, your "map pick" is played unless your opponent is also due in which case coin flip. There is a counter on your screen "2 more games to play your map pick".
This also allows players to help out individual map makers by picking their maps and thus helping people experience it.
On average, 2 out of 5 games will be player picks, 3 map pool.
Some basic limitations should apply like the map should have 3 unique reviews for example. Also, picking a cheat map and showing knowledge off and using the cheat is bannable.