A lock-off room counts as a 2 bedroom for determining total points. The point costs of the studio and 1 bedroom in a lock off have no effect on a resorts total points. By increasing the point cost of those lock-off studios and 1 bedrooms,
DVC can created new points that only they have access to.
Here is a simple example. A resort has 1 room only, a 2 bedroom lock-off. The 2 bedroom costs 30 points, say DVC sold 20 points to one person and 10 points to another person. The resort is now sold out and has a point total of 30 points. Lets pretend the studio originally cost 10 points (want to keep that original cost low to attract buyers) and 20 points for the 1 bedroom. So one person can book the studio and the other the 1 bedroom. Rooms are fully booked up by owners.
Now lets have DVC change the point cost and we will use an extreme example to make the point. 2 bedroom stays at 30 points, so no change to the total points at the resort. 1 bedroom is increased to 29 points and studio is increased to 28 points. It now takes 57 points to book the studio and 1 bedroom separately, but the resort only sold 30 points. This leaves 27 points created out of thin air that only DVC has access to. Plus neither of our original owners have enough points to book either the studio or the 1 bedroom.
So the lock-off premium is a big deal because it doesn't count towards the resort totals allowing DVC to make it impossible for owners to fully book their own resort and giving DVC access to free points at sold out resorts.
And the reason I believe this was done on purpose is that there is no way in a million years that 1 bedrooms should have increased in price anywhere. Every single owner knows those are the last to book up. They should have gone down in price.