I think it's because photos allow us to see the world through the eyes of others and sometimes in ways that are quite different and fresh.
Wow! This shot created a beautiful and interesting mood.
Nice shoot!Morning or evening?Its fun!
Beautiful.When you see falling leaves, you really have to take many many photos. It just is so.
I am so with you!
Oh that is nice. Very well done. My answer: because it is FREE. We no longer have to pay for developing.