For PKO's, the real value lies in winning it outright. Very often the 1st prize shown in the payout structure will actually be close to double of what's shown (because in the end you win your own bounty). So in the early/mid stages, don't go crazy for bounties. Instead play your standard solid + aggro game with well timed stealing. Open up more if you think your table is passive during the later stages and of course always monitor stack sizes and bounty dynamics. (Also be in the lookout for the Booty Hunters/Snipers, they are really gunning for the bounties and are often risking their tournament lives for a small or medium bounty, use it to your advantage when possible).