A great article on Forbes.com on vintage poster collecting:
“Unlike fine art, poster art is designed to speak to as many people as possible. And unlike many art forms, you can own a significant poster image for as little as a few hundred dollars, with the sweet spot of vintage poster prices in the neighborhood of $2,000.
…Hot subjects include golf and skiing. Good golf posters from the 1920s and ’30s showing important courses with people on them, Lowry says, are “over the moon.” This illustrates another important point: Whether it’s a travel poster or a liquor ad, the inclusion of people in an image adds instant value. And according to Rennert, people with “attitude” add even more.”