All I know is this... In my area the people who quote aeration are crazy. Seriously, 4 neighbors, plus myself, last year all had their companies quote aeration. All bids came in over $400.00, relatively flat 1/3-1/2 acre lots with anywhere between 10k to 15k of turf to aerate. We even went to two of the companies and asked for a discount based on 5 homes in the neighborhood with no success. These are people with annual income in the 150k-200+k range. We all balked. Went to rental equipment store, rented an aerator for the day at $85.00, bought 150# of Lesco 50/50 seed for about $180.00 and did it ourselves for $50 a property. Now with that said, we joked afterwards that running the aerator was more strenuous then we thought it was going to be and we were all sore the next day... but to save $350+each, it was well worth it... $2000 worth of business not had because of high quotes. If they can get it... all the power to them though. All I'm saying... is keep it real. Good Luck.