My very first answer on this site remains my favorite post and largest rep gain in a single post of my SE.career. I was rather proud of it and apparently others liked it too, as it eventually gained me the second awarded Reversal badge of the site. Sure the question was ill concieved but my answer was not. Now, months later, that question has been deleted and my well deserved reputation from my answer seems to have gone with it. What is the reasoning behind deleted question rep loss? I'm rather sore at loosing my rep, even as I'm sore that my well conceived answer was deleted with the question.
Here is the body of your answer:
For the sake of answering the question, I am a US Soldier currently deployed in afghanistan. My unit reguarly gets into firefights and takes indirect enemy rocket fire. No, war is nothing like a video game. (big surprise)
While this is a nice bit of insight from your privileged position, it is not reputation earned from your expertise at videogames. Your answer could've probably saved the question had you gone in more detail in how exactly the two experiences are different (although for all I know you probably have NDAs preventing you to do so), but the sympathy upvotes you got certainly didn't help in this regard.
Reputation is a measure of how much the system trusts you, or more specifically, of how much the system trusts that you know about the topics that the site is actually about. You need to know what people are talking about before you can start deciding whether questions are on- or off-topic or before you can vote to delete or keep, and even as a 20k rep moderator this can be difficult.
This is why reputation from deleted answers doesn't count.