Fair play to you Aidan. You sold a product to someone who was willing to pay that price and I hope your buyer is pleased with his end of the bargain - you are clearly pleased with yours.
I think you are probably right that this is a case of fur coat and no knickers which is trading on the back of previous Ardbeg limited editions which have sold exceptional and old whisky at low prices. But that's the nature of collectibles.
Ardbeggians who are new to whisky might, though, reflect that when I started drinking 15+ years ago:
Ardbeg was perceived to make poor quality whisky that they couldn't sell, which led to repeated mothballing of the distillery
Springbank was perceived to make very high quality whisky at all age statements (including the young ones) although it had not had that reputation for very long
Glenlivet was perceived to have declined alarmingly, although people did still buy it and collect it based on its former reputation for very high quality - and some of the bottlings of very old Glenlivet did still show that high quality
I offer this merely to show that reputations can fall as well as rise. I hope Ardbeg continues to prosper, especially as their reputation is founded on quality of current bottlings rather than silly gimmicks. But it is not a sure thing!