Things I have learned because I own a horse...
1) A good BO is worth your horse's weight in gold, (this also goes for fellow boarders who look out for your horse when you're not around!)
2) If I ever become a BO I'm going to keep the best stalls/paddocks/pastures for myself and not give them to the boarders just to take them back again. Oh and I'm going to thank my boarders when then do things that make my life easier. Basically I'll learn from my experiences as a boarder to become a good BO.
3) Patience is very hard to have with some people, especially the kind that think they know it all.
4) Don't whine about your BO on COTH because people will just tell you to move your horse, but don't compromise your horses' safety because you are too lazy to find a new barn.
5) I will never own a horse unless I can afford to care for it, and all of the trouble it may cause.
6) When I own my own property I will pay extra to put up good fencing because it will save me heartache and money in the long run.
7) The best way to end a rough day at work is to snuggle with your pony :D and then go home a drink a glass/bottle of your favorite adult beverage...
Anything else you would like to add?