Times of use vs shelf price vs rental price = the decision to buy or rent.

For me, I left most of the large ticket items that I only use once or twice a year to rental. Smaller items like nail guns, airless paint sprayer, etc. I use the above equation to determine which is best for me.

Regardless, as long as you stick with good quality tools, your investment will be worth it. Buy a cheap tool is like buying toilet paper, once you get it out of the store it's worth less than half of what you paid for it, once you've used it no one want it back!