It's not like a two dollar discount is going to change much without any front page promotion. The 5.99 albums have a section on the front page of iTunes devoted to promoting their discounts. Gaga's never had that so why would it make some huge difference
The Fame Monster routinely charts despite being 15.99, Cheek to Cheek (Deluxe) being 14.99, and oop @ ARTPOP charting too.
Tity is still panned and known for being talentless