I think it must have something to do with Tosy paying Bieber for the publicity. It might dilute his appearance there if Phoneguard is getting free PR and visits from Bieber.
I can tell you, that I spoke to Stephanie Prince yesterday, and asked about an expected appearance and of course she could not say for certain. But, I did say, that we know Dr. Braun (Scooter's father) is like a surrogate grandfather to Justin, and how could ne NOT go by the Cellairis booth. Her response was, hmm, yes and Justin is very close to St. Clair also. Justin and St. Clair have a very close relationship.
She also said that the Bieber commercials are amazing, and about Phoneguard. She has seen them.
OPMG