(T)Eddy wrote:
They'd probably would make even more money if there wasn't a US law prohibiting the image of living people on stamps.
The USPS issued stamps in 2007 for Star Wars, depicting the living actors as the characters they played. And in 2013, they issued stamps showing scenes from the Harry Potter movie, again depicting living people. The USPS gets around the 'no living people' rule by saying they're honoring the
characters, not the actors who just happen to portray them.
Actually, a few years ago the USPS was considering eliminating the rule altogether about honorees having to be deceased, and there was a rumor that one person was under serious consideration to be the first living stamp subject, but nothing ever came of it. (And the identity of the person being considered remains unknown.)
In the entertainment world, the closest a living person has come to be directly honored on a U.S. stamp was with the Celebrate The Century stamp series of the 1990s. Among the stamps issued throughout the series were two from the 1980s honoring TV shows that had their star's name in the title, Seinfeld... and The Cosby Show.

(T)Eddy wrote:
I think James Doohan and Gene Roddenberry would be the only people who would qualify to get on a Star Trek stamp in 2016. (DeForrest Kelley and Leonard Nimoy haven't been dead long enough yet.)
The USPS has relaxed their rule on how long you have to be dead in order to be on a stamp. Maya Angelou, who died in 2014, got a stamp in 2015.