Why this thing called "FUN"?

Picture obtained from:
http://www.tumblr.com/tagged/enthusiasm

You may be thinking why is fun so important, surely there must be something more important than fun. To some people they may think fun isn't the most important thing and to them it may not be but for me and many people i know it is because the main thing we seek in life is to enjoy it and you enjoy fun but it is not all about hanging out with your friends and having a good time for all your years there is also a work related part in fun. When you think of what you want to do when you grow up if you are my age or at any age for that matter whether you have already retired or you are in the middle of your job while you're reading this right now, you usually pick something or have already picked something that you will enjoy doing for the majority of your life because we work harder at things we like doing.

Picture obtained from:
http://mariamontessori.com/mm/?p=1704

No one likes getting up everyday to go do something they hate no matter how much they are getting paid even if it does help ease the hatred and how are you going to enjoy your life doing that? If you are getting up everyday to go do something you love you are going to be way more enthusiastic and 9 times out of 10 do a better job than someone who doesn't like it. If this is true then we should just make everything fun and then things will get done better and everyone will be happier right? Well, it's a little more complicated because if you give certain people too much freedom they will abuse it and the job will not be completed but if you give them too little then they will hate it. Take school for example; kids hate going to school because it is boring, doesn't interest them and isn't fun but if we made it those three things then they would enjoy going and learn better. 

Picture obtained from:
http://www.fanforum.com/f353/episode-discussion-3x17-basic-lupine-urology-63054901/

This causes a problem because we then have to figure out how far we can take it before students abuse the freedom but also it creates an inconvenience for the leaders of the school board because they usually do not share the same ideas as us and don't find fun a necessity and don't want to inconvenience themselves with it.

If we implemented fun into everything, the right amount and the right way everything would be more enjoyable and get done better but how do we do that?