(Please take any political implications with a grain of salt - I love my country, regardless of which party is mismanaging it at any moment)
Nice photo, for sure. Something about anything Patriotic that will get folks to open their wallets. I do love the combination of solemnity and patriotism in your shot, so it's not surprising in any way that someone would want it in their home. 50, in my most humble of opinions, is a good number to land on for such a limited edition.