For many, practice is their way of giving themselves 'permission' to do well (succeed). If you are 'hung up' on the 'work ethic' (only success comes to those who work hard) - this is your way of saying it is okay to suceed.
For others, it is a way of combating 'under confidence' (I don't really trust what I have).
For some, it is the pure joy of hitting the ball purely (along with finding ways to express their creative selves - how many different ways can I move the ball).
If you believe in the 'American Way' (I must be the best, I must be a 'winner' - if you are not a winner, you are a 'LOSER') then most will be sadly disappointed and have low self esteem.
However, many players are willing to accept that they are not TW (many do not want to be) and are content being 'good' (or the best they can be) without tying their self worth into their performance as players.
I have the greatest respect for players like Bruce Leitzke and Carlos Franco - they trust what they have, can accept their place as a player (that does not mean they do not want to win), but winning is not the 'end all' of life.
When I played the Senior Tour (92-98), I worked too hard, tried too hard, did not trust enough -ergo a lot of time hitting balls and not enough time chipping and putting.
I enjoy practice now (limited time) just for the fun of hitting it solid (almost orgasmic at times - perhaps a little strong).
Great site by the way!
Bruce