don't get too cute during blind battles

I see this line all the time online, and almost never in live games. Here's the thing about blind battles-- they are tests of fold equity. And once it becomes apparent that you have none, you shouldn't be throwing good money after bad into the hand unless you have the best hand. This guy must have known he did not have the best hand:

PokerStars Limit Hold'em, $0.50 BB (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Preflop: Hero is SB with K, Q
5 folds, CO raises, 1 fold, Hero calls, 1 fold

Flop: (5 SB) Q, 8, 7 (2 players)
Hero checks, CO bets, Hero raises, CO 3-bets, Hero calls

Turn: (5.5 BB) 9 (2 players)
Hero checks, CO bets, Hero calls

River: (7.5 BB) 10 (2 players)
Hero checks, CO checks

Total pot: $3.75 (7.5 BB) | Rake: $0.15

Results below:
Hero had K, Q (one pair, Queens).
CO mucked 5, 9 (one pair, nines).
Outcome: Hero won $3.60