D
Daithi
Rock Star
Silver Level
The Odds Calculator says that even if the villain QJo your chances of preflop are about equal. Why risk half the stack?
For several reasons. 1# Dead money. The payout isnt 1:1 but probably something like like 1.7:1 depending on the Ante. 2# Although they both get 50/50, villain gambles entire lifeline while Hero gets to survive.
Your selection of QJ actually fares out stronger against 99 than AK, as they both are still overcards but QJ has more chances to combine (though the 99 block 2 outs). For example have a look at 99 vs A7 which likely would be in his range too. Hero holds 70% equity.
3# Might slightly psychologically affect stealers against him for next few rounds.