Perhaps I could offer a response, or riposte, on behalf of the purchasers of such cases…
Without wishing to come across as bragging (that isn’t the point of this) but I have 898+ bottles of wine sat in my cellar (with many more pending). The trouble is I know only too well what I like. I spend interminable hours staring at the racks wondering whether those wines are ready to drink, and thinking, that on an idle Wednesday with a fish supper, would that just be a waste?
If I were to simply order everyday wines in the same price range as these, for immediate/mid-term drinking, I’d simply only ever buy Thymiopoulos, López de Heredia and La Rioja Alta, with a few South West France producers thrown in, because frankly I find the quality for price from those areas to be streets ahead of most others. Which leaves me in a wine rut. And no amount of staring at wine lists could ever change that, because I know that’s the usual outcome ‘yeah it’s alright, but I could get better for that price elsewhere’.
Moreover, the mystery case we got came with about C. £30 added value (the inexactitudes of finding what the actual, removed, TWS price was aside), so I’ll probably be trying wines that I wouldn’t normally purchase (as above). I have no doubt that several will disappoint, or perhaps not live up to expectations - a case in point we had The Rotier Gaillac the other night. Way too much Syrah, doesn’t blend well with the indigenous varieties, there are far better Gaillacs out there, but not in Lockdown for £7.92 delivered, unless shipping over from someone like Toulouvin, which of course involves buying a full case of South West wines.
TWS is one of the few (only?) supplier in the UK where their huge range makes a mystery case, at those prices, a reasonable proposition.