I usually call Sammi out due to her negative nature, but I agree with her. It's just a prediction, nothing confirmed or certain. See Kworb's prediction, they are usually very accurate.
i think Billboard may be on track with their predictions.
they were able to nearly accurately predict HIAM and BTW's first-week sales last year. They are well-connected with Nielsen Soundscan, so I am sure they have someone tipping them off with near-perfect numbers. Wednesday will definitely tell the tale.
She may beat Britney though, HIAM did 411K on its opening week.
But no matter what happens, the three of them had amazing opening sales with their singles