Southernplayalistikcadillacmuzik & ATLiens went Platinum while The Infamous & Hell on Earth went gold... which means they were outsold by a 2-to-1 margin at least. That isn't "slightly" outselling someone.
Whether they did shows in NY isn't the point. The point is they didn't NEED NY in order to move units.
Bone went to LA to get a deal and were based out of there. Snoop, the same. Outkast & Goodie Mobb were based out of Atlanta. And Scarface & 8Ball & MJG were based out of Houston.
NONE needed the NY market to sell records. And they were able to outsell Mobb Deep and most of their NY contemporaries.
Goodie Mobb's debut went gold the same year the Infamous went gold. And did it while operating out of a smaller market.
On Top of the World (ball&G) also went gold the same year as the Infamous. And their gold record was far more impressive given the fact that they went gold on an independent label and had no nationwide radio play or consistent video play.
Also might be important to note that Ball & G have more platinum & gold plaques than Mobb Deep and has outsold them career record sales.