who have been around for many years don't put up new pictures more often?

My guess is that their appearance doesn't change all that often. As long as the pictures work, why spend the money to change?

Their appearance might have changed significantly and posting new photos could effect their earnings.

Use the way back machine on their website...

http://archive.org/web/web.php

help give you an idea of how old the pics are...

Yep that's my reasoning too.  They don't want you to know they're 10 years older, or have gained 30 lbs or are flabbier.
I've been duped by old pictures a few times, and although I usually ended up having an enjoyable time, it's a huge initial disappointment when you're expecting the door to open to Jennifer Lawrence, but instead you get Adele.

and I LIKE my crazy pictures and crazy stories.. it is part of what I offer. I dont care how old they are.   I ADD to that over time but I dont erase the magic that has already been created.. it is still me.  But my appearance is not really why men's cocks point my way .. it is my beast, my energy and my LUST..and my beast is as RAVENOUS as ever!

great point!

my site is full of pictures of me now and throughout times..lol
Its hard for me to take down , just because I add new ones.  one day I'm going to have quite the collection

I try to update my photos every 3 months.  I prefer no editing, or photo shop either.