Easy answer is that they understand the Loop Hole of the BCAPL in raising people from one division to another.
If a team fields 5 OPEN Players and they finish in the top 16 teams then they would all be moved up to Advanced the following year, UNLESS, individually they played in the OPEN Singles and DID NOT get in the top 48 spots.
Scenario A) Team X has 5 OPEN players, 3 of the players play in the OPEN Singles and all cash high enough to double or triple their money, but they don't crack the top 48 players. Team X plays in the Team event and wins the event ($12,500). The 3 players that all played the OPEN Division then get to stay in the OPEN Division the following year, based on their Singles Finish. The 2 players that did not play singles will be bumped up to Advanced the following year. If 2-3 of those OPEN Players also played scotch and finish in the top 8 or so, they are making even more money.