Robert -
Many of my clients use postcards for marketing their businesses - and I have for promoting my last book. Most (including myself) have opted use the 4 x 6 card and not increase postage costs.
You might look into postcard print houses that also offer mailing services - or check into separate mailing houses - for permit use to decrease mailing costs and provide the availability of targeted mailing lists. Several of my clients have targeted mailings in the past by zip code, household income, type of business and other options. I don't know that the handwritten address makes much of a difference - but one of my personal service clients did have their card addressed by the mailing house using a font that had a handwritten look.
One thing my clientele has avoided is packaging their postcards in the "valu-pak" type of mailings. A couple of them made use of the services to initially and had a much greater rate of return with an individual postcard being mailed.
Many years ago I did a targeted direct mail piece. Over a period of a couple months I compiled a mailing list of my own - confirming the contact names to ensure that the piece was getting to the specific buyer of creative services. One of the most useful tools in compiling my list was the Business Journal's annual Book of Lists. I believe you can also purchase mailing lists from the Business Journal. Another great resource would be the monthly lists published in Media Inc. and their directory publications.
A one-shot postcard mailing is not always going to bring you the greatest return (much like one-shot advertising of any kind). In the past, - as a buyer of design, writing, photography and illustration services - the potential resources that caught my attention were the ones that did multiple mailings over a period of several months.
I also had what I referred to as the "Metropolitan Refrigerator of Art" test - if a postcard was especially clever or well-designed I posted it on the side of my filing cabinet or on my office bulletin board. When I needed a specific service those vendors were most often the ones I called.
Good luck!
Jeff Fisher | Jeff Fisher LogoMotives | Tweet! Tweet!

