Inflation
I have owned (and used) many bicycle pumps over the years. None of them stayed in service for long and I didn't care. They were simply a crude means of getting air into the tires of some bike.
Now that I have some serious two-wheeled vehicles in my stable I have started to understand the importance of proper and regular tire inflation.
Today I "invested" in a Lezyne Alloy Floor Drive pump. A work of art and I think it will stay with me and my bikes for many, many years.