Yeah I don't know....It's hard to gauge intrinsic value. I'm not referring to the kit for sale....rather an unmolested version of said kit. But it really depends on how long the legend of Bonham endures. If future generations continue to iconize him, then maybe the "stuff" related to his icon will continue to grow in value. But, in all honestly, I think music is going to continue to evolve in ways we can't even think of and Bonham will be the future Baby Dodds or someone like that....Zutty Singleton or someone...ya know? -meaning that only a few historians will recognize the name. As fades the legend, so fades all the related trappings.
But I really think what we are witnessing in the one for sale is a father/son relationship thing and not so much a serious sale. He might as well price it at ten million dollars....Why not, right? Guaranteed it's not leaving the guy's house!