I feel as though there has to be a constant reminder of self loathing to continue with working to your goals. Personally, every time I feel comfortable with how I look I stop eating right and exercising because I don't see the point.
It sounds unhealthy to keep up 'self-hatred' and the term sounds a little extreme but I am sure this is the one way to make sure I keep this up for a long, long time (like forever).
I'm not the type of person to ever be satisfied with where I am but I won't let the dissatisfaction ruin everything - just use it for further motivation! This is really what I think lets a lot of people down, you reach one sub goal and feel like it's enough and then forget about your actual dream goal.
I suppose it is just important to to keep setting new, bigger goals so that we don't fall off our path. After all, in my opinion the hardest part in reaching my goals is the maintenance and making it long term - not giving up because I am satisfied.