I hate to agree with Zephyranth, but really there's nothing except hearsay and old memories connecting Durst to All Good Things. It was a well known store and it was there before he was; I seriously doubt he was ever a part owner. (But he could well have worked there. It was pretty common for food co-ops to either require you to work as payment for your share, or allow you to.)
And again, as Zephyranth pointed out, it was pretty common for kids to tune in and drop out in those days. Especially offspring of the military-industrial complex who wanted to join the peace movement, get back to nature, live off the land, et cetera. It was so common that most police departments wouldn't even look for a kid before several days had passed.
Say, Carbuff - when you say ATG was a well known store, there before Durst was, when was it established? It seems to me that if it was advertising the name "All Good Things" as a brand-new venture in March of 1972, it was neither well known nor provably there before Durst was. Not calling you out on this, btw, I'm well aware that the accepted story is exactly that, but the accepted story (on just about everything connected to this case, it seems) is proving to be pretty flimsy.
One piece of hearsay tells us that two anonymous "male students" saw Lynne at a health food store in December 1971, but it's starting to look a bit dubious as to whether ANY health food store in Middlebury was called All Good Things at that time. Which means that a sudden, new, witness account springing up years later, claiming Lynne was at All Good Things, is very suspicious.
The real issue to me is not so much the name of the store, but the fact that that we have absolutely zero proof, to date, that Robert Durst ever set foot in Middlebury and Ripton, much less lived there.
The question looming very large now is why two current residents of Middlebury who lived on a rural property in Ripton at the time of Lynne's disappearance in 1971, would suddenly be working overtime decades later to try and establish a brand-new story of a serial killer living at this same property in 1971.
I would add the need now to examine VERY closely their claim that Durst suddenly came back to VT to visit in 1976 (laying groundwork for someone moving a body at that time--making sure it can be pinned on Durst?) None of this means that any particular person committed murder; they could be covering for someone else, or simply covering up an unfortunate accident.