Slanted Chimney / Possible Removal

[Rick Sheldon]

It looks like this chimney might have been built with angle intentionally, but I wanted to see what everyone here thinks:

Follow up question: about how much might it cost to have this section (attic and roof only) of the chimney removed so I can turn this into a finished attic? It feels like a waste of space, since it already has this awesome flooring and staircase