97% is good - it's the ratio of upvotes you give vs downvotes. I think it mostly serves to prevent things like someone downvoting every post/comment of someone they've disagreed with - it would lower their 'attitude' and after a certain threshold, their downvotes would stop being registered.
(the opposite of 'attitude' is 'reputation' which is the ratio of upvotes to downvotes that other people give you)