In Direct Mail, One Idea Per Postcard
You won't have a lot of space on your postcard, so don't spread your message too thin. One fully developed topic is a hundred times better than five half-developed topics.
By focusing on one product (or service, or idea, or topic), you can develop it in a way that is more likely to generate a response. You could mention the primary benefits, give a testimonial or two, show some photos, make a strong offer and provide a call to action.
But you can't do all that while covering several topics. So save the multi-topic approach for your brochures and website.
People request brochures, but they don't request postcards. For that reason, they give postcards a lot less attention. A quick glance may be all you get. So keep your postcard focused and to the point — one idea per postcard.
Happy Direct Mailing!
-Brandon from PostcardSmart.com