These are all great points Sean especially the follow up after you have lost the bid to another company.
Losing a bid is not always a negative thing. Losing a bid on a project with curbside appeal can become a positive thing. Customer picks another company, company does a great job, but many problems arise between customer and client. Enough problems for client to completely write off the company and never use them again.
Neighbors, co workers, friends and family will all ask "who did your work, it looks great" Customer might say "ABC Landscape did it, but it was a giant stressful headache. If I had to do it over, Will P.C. Landscapes would be at the top of my list"