The dictionary definition that I read this morning is:
Adjective. (of a victory) won at too great a cost to have been worthwhile for the victor.
A recent victory for someone very close to me has come at an incredible cost.
I cannot help but think that perhaps the cost has been too great.
Whilst I am very sad for the people concerned, at least this post allowed me to learn the history of this particular phrase.
Every cloud, as is said by whoever “they” are.