This may be a strange question, but why would someone call you from a postcard? Seems like old style marketing to me, unless the postcard is personalized somehow.
Mailings themselves are very, very, very tough to turn a profit with, doing it without a personal call to action will make the returns pretty low, in my opinion.
Mail 100 actual quotes out a week. You'll spend a bit more time but get a better return.
Dan
I have a direct mailing letter with quotes for each homeowner, but i decided to go the post card route for this year because i share the space with the CPA who wants to advertise his tax season services.
Also mine is somewhat very narrow targeted audience.