I think one of the things that’s very difficult to predict is this community. You need to realise that intentionally or not, we are acting as influencers. I believe there are a lot more people lurking than contributing and sometimes when one person posts favourably about a wine there can be a domino effect with many more backing it up and a LOT of people, including those lurkers, rush off and buy. This sort of spontaneous high demand can be almost impossible to predict. And taking Senejac as an example, when I saw all the posts about what a great deal it was and everyone rushing off to buy I wasn’t at all surprised to see it sell out very quickly.
Similar things can happen when any well known influencer with a lot of followers starts raving about a particular product and suddenly you can’t get it anywhere.
There was a good example of this in the climbing world from over twenty years ago. There is a good high quality producer of down products called Rab (they do a lot of other stuff now but back then it was only or mainly down). This was really before ‘puffer’ jackets became a common thing, about the only place you saw down jackets then was in the altitude and/or winter climbing scene or any of the various extreme climate scenes. However one day a certain famous band appeared in concert with the lead singer wearing one and suddenly it was impossible to buy a Rab down jacket for love or money. This lasted for five years or so until the fashion market had got their own brands going and recognised.
Another thing to be aware of is that if something, like the Senejac, has flown off the shelves like this you can bet the buyers will be trying to get more if it’s available. And it often is, so I wouldn’t be surprised to see it appear again in a little while. As has happened with a number of other wines that suddenly gain popularity such as the Ulysse Pauillac which flew off the shelves with all the hype (me included on that one - I love it) and it went out of stock then more stock appeared and repeated that cycle two or three times.