This is the only rational position for owners (and college basketball fans). For players . . . not so much.
For owners they get to really see the players in action prior to making a multi-million dollar commitment to them. The only thing I don't understand, and I don't know a lot about unions, is why wouldn't the players association as a service to their present membership, agree to this as part of the CBA. It would guarantee a large percentage of their active membership some extra money and years of service if, even temporarily, they slowed down the influx of new players to their league. Is a union responsible for negotiating for future members, the hsers/underclassmen who would lose out on a couple of years of pay?