I think her fans had a lot to do with it. Rushing into threads saying that Katy would be toast in the US once Gaga rush released her single. Now that it's stuck at #2 on US iTunes, people are genuinely shocked (or trolling

) because she couldn't take out her "lessor" in the States.
WW, yes, Gaga is doing amazing, and I don't think anyone should take away from that (or Katy, who also is doing well WW).