The book states:
Does this mean that if you spend 50gp all ability scores the item has increase by 1?
And if you spend 400gp all abilities increase by +4? etc.
To me this seems far too cheap and I am thinking it is meant to read that spending the money increases one ability score but it seems a bit vague.
On the other hand as the item only gets 2d6 die to determine ability scores instead of the usual 4d6 less the lowest die roll I could see where this may be implemented so that their scores are comparable to a player character.
As a side note this is an item being created as a player character for one of my players.