Going off of the last tip, after you have spent the money to get that good quality equipment the key to making it last is cleaning it regularly. As someone who owned only a synthetic western saddle for several years, I must admit to not following this tip until the last year or so. My saddle didn’t need the maintenance of a leather saddle, and as I was just riding as a hobby I never bothered cleaning any of my tack or other equipment. I’m forever astounded that my bridle lasted without once having been cleaned or oiled.
To start off with if you have a leather saddle, hopefully you do that synthetic one was awful for many reasons, you need to clean it with saddle soap regularly and oil it as necessary. Normally only once or twice a year but if it has been neglected I would do it after every time you clean it for a while. This applies to your bridle and reins as well.
Properly cleaning your leather equipment is definitely the most important as it can dry out and crack or even break off, and trust me it’s not fun when your stirrup leather falls off while you’re riding, you also have to remember to clean the rest of you equipment as well. Another important thing to make sure is clean is your saddle pad. Your pad goes through a lot of sweat, dirt and hair. It is important to get that off every so often because not only is it uncomfortable for your horse, it could cause some real problems. The way I clean my pads is to take the garden hose to them and rinse them till the water runs clean. I also know of some people who take their pads to the car wash to use the power hose. I also suggest taking your curry comb to your pad in-between washes, especially during shedding season.
Don’t forget about the little things to. If you use polo wraps or other cloth leg protection you can wash those in a washing machine, or if they are neoprene rinse and wash by hand. Do your bit as well, especially if you use the same bit for more than one horse.