If it were twice that size, i'd offer $150 for the entire log. It's an ok burl at best, being that it likely shows some interesting color. It's not one of burls we love so much that has eyes & swirls all over. There are three types of burl I see commonly. There's burls like this that just look like a folded over growth on the tree. Then there's burls that look like a coke bottle bulge in the middle of the trunk. And last is the "eye" burl that we all like & it looks like a giant buld sticking off the tree or growing at the base of three from the roots & it'll have hundreds of tiny little branches & sprouts sticking off of it. In the winter, those sprouts die but you can still see the visible blisters where they were, and those blisters on the outside are the swirls & eyes you see on the inside.
Sorry for the long post. I appreciate you bringing something like this to light. It's interesting.