i do my own stuff
a man i work with used to work for an outfit,to remain unnamed;
{TruGreen ChemLawn Care - ServiceMaster}
he said they watered down the chemicals to about 10-15% of what was supposed to be really put down on the lawns,and the pellet type fertilizer when used was put down at less than half of the normal amount.the large companies are in it for the money,not to do a great job.
He tells all the people at work,if you hire a lawn service go with the small guys and ask for references,And go look at the lawns they do.