Rented my first core aerator recently (I know it's still early to be used) and it was totally worth it. My question is, if it's going to cost me $100 a year to rent for the two recommended times (beginning of fall and spring), should I just go ahead and drop the coin to purchase one? They're like $540 at Home Depot. The reason I ask is that I'm sure these machines don't last as long as you would want them to.