They do make good money so what do you mean by their strategy? To me whatever their strategy is, has worked well. I assume you mean it's because they shoot too many DAP scenes. But they still get hired from other companies. So this idea that they won't get jobs after is a myth. These twins are still wanted even today I see them making movies for big companies in Europe.
I think they are mighty successful away from porn anyway with their promos. One of the sisters is a DJ as well. They don't really need the porn. They do it for fun. Anyways they are being paid mega bucks for what they do.
I think They can quit now and it wouldn't even affect them.