Britney did flop 5 years into her career. Actually 3 years. The entire Britney era was a flop. 10 million in 2001 is extremely poor. And Kworb already spilled the tea yesterday with his stats. Gaga's first 3 eras combined were bigger than Britney's in terms of album sales.
Born This Way sold 7 million and was considered a flop by the Britbots.
Only when they're moonlighting as the Britards and don't see the irony in failing to consider market differences for albums and then turning around to whine about using Brinty's early 00s tour receipts.