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No. Just cover the ground you can with the funds/time available. You can't get your name in front of them all. A great deal of mailing cards get thrown away the instant the HO realizes its "junk mail". I believe a lot of them don't even get a thorough glance. But there's always those few that...

If you want leads, go hire a marketing pro to do mailers in areas you target. You'll get leads.