Heart, Courage , No fear of losing the money u have on the table. Doyle wrote it in his book and just yesterday i heard an interview with Tom Dwan who said the same thing. If they were offered 2 to 1 on a coin flip for a million dollars they would do it in a heartbeat. Doyle said he would do it for ALL his money cus he knows he could win it all back if he lost.
On the other hand i have sat down at the casino before with money that meant a lot to me and got KK on the 1st hand. I re-raised an early raiser and when he insta shoved i folded. Now he may have had AA but more likely i was better than a 2-1 fav over his entire range. But i didnt go there to play 1 hand and leave and i didnt want to risk all my money on what amounted to a coin flip. Its much safer to just sit there 4 or 5 hours and grind a small profit. And playing safe is why im an broke SOB and Doyle and Tom are worth millions...You have to have the guts to gamble ANYTIME you think u have an edge. I cant do it no matter how hard i try.