this is not my line of work and no do I intend to get in to it ....... at least for a fair few years !!
Have you ever thought of closing the deal there and then as you are giving over the written quote, do you normally spend time talking with potential clients ?
find out there needs ?
getting to know them and like wise ?
talking about there biz , i.e showing an interest ?
letting them know you history and the other service's you offer / ( If applicable )
these are just some of the steps I take if I really want the client