Yep, it isn't a missed opportunity - bloody annoying though :)

>The price of the heating system could have gone up after you got yours. Then you'd be writing a self congratulatory post extolling your excellent decision making skills and luck would not get a mention!

They might go up based on this and Covid. But I think they will not rise significantly. 

> If it weren't for bad luck, you'd have no luck at all

People say they have "zero luck" as if it is a bad thing - Neutral is okay if the alternative is negative :D