Athwartship S Bend in Mast

[Water Dog]

I'm surveying a boat for possible purchase and use as a blue water cruiser. Budget is a big issue. It has a slight S bend in the mast that is permanent. Loosening the standing rigging did not straighten it. Its bows slightly to starboard between the deck and the spreaders and bows slightly to port between the spreaders and the masthead.

Any thoughts on how to determine whether this is a problem?