Why aren't your music videos on iTunes too?

I think your music videos are equally as worth celebrating as your music is (if not more), so why is it audio only that's available on iTunes? I would happily buy them.

I'm currently a bit obsessed with the Graduation Song and it's a great video! I guess I always have an internet connection so it's not a problem to watch them for free online, but if I were to show my support for you guys by buying something, I'd want the videos! If Beyoncé can do it, so can you. Not generally true in life, she's pretty amazing.