Conceding - Yes/No

I just wanted to check everyone's opinions on conceding matches. Personally, I hate it. 90% of the time (or more) when people concede, it's when they'd lose the very next turn, anyway. Conceding is simply taking away the satisfaction of that last hit.

I've only conceded once, and that was because one of my kids woke up from a nightmare, so I conceded and went to tend to my daughter. Otherwise, I've taken every loss by letting my opponent get that last hit.

(Additionally, why do people concede? Most of the time it simply saves a few seconds, and that's not. Maybe a minut til the end of the game, tops.)