Recently I played a blitz game (5m+5s) with an opponent with rating 1500+. I had a clearly losing endgame (K vs KQ). My opponent was not under any time pressure but he made a blunder and the game ended as a stalemate.
I know this does not happen every day; it is extremely rare that I can draw a clearly losing game, but it may happen say once out of 100 games. If I resign whenever I feel hopeless, my record for these games will be 100 losses; on the other hand, if I keep playing, it could be 1 draw and 99 losses. So my overall record will be slightly better if I never resign; instead, I keep playing until I am checkmated or rarely, the game ends as a draw.
So continuing to play in a clearly losing game seems a reasonable strategy. But it is considered as bad etiquette not to resign when the game is clearly hopeless?