The USPS used his photo for the Nebraska stamp.
Postal Service introduces Nebraska statehood 'forever' stamp
Postal Service introduces Nebraska statehood 'forever' stamp
That would be my guess, but it is only a guess.Really? So it's just for Prestige and exposure?
In most cases, federal government policy is to pay something for reproduction rights of content like a photo (unless it's in public domain, of course). So probably $1. Of course, since this license is certainly non-exclusive, he can now may big bank selling large prints, phone covers, tote bags, etc.
Well to have your photo on a stamp is a pretty big deal