Okay, since there is only one person that I know of working with the "violophire" genetics at this time in the US, we can all assume we know how it works, but since there are no "test results" it's just that... and assumption.
A pink white can be created from a white and a beige, yet when it's created, it can pass it along together as a NEW combined gene. For example if you breed a white to a std you'll never get a pw. You can get a pw white from a white and a beige, both of those genes are required to create the pw gene, but once it is created it can be passed along as a new gene, show in the fact that you can breed a pw to a std and get pw. I know that you will say because it's not a recessive gene, but something changes when the pink white trait is created that doesn't follow the normal rules, how do we know that there is not a new rule created in the blue diamond genetics?
And as far as getting a "few" pink whites, that is again speculation based on numbers, not based on proof. I had a pink white male who threw me 18 pink whites out of 19 offspring. The other was a beige. He was paired with standards and a beige female. So the "few" pink whites he through were almost 95% of his offspring.