What are the reasons that droved Pacquiao to go ahead despite the injury?

1. The magnitude of the fight - Millions of people have been waiting for this fight to happen for 5 years and have invested a lot of money and time in anticipation of it, Manny being a warrior wouldn't want to be the sole reason for the dismay why this fight won't happen. 2. Time invested in preparation for the fight - There is this true story of some rich guys went to climb Mt. Everest, paid a guide handsomely, but was cautioned not to go ahead on certain time, because during those times, weather will be very unstable and death is a possibility, but then nevertheless, they decided to go ahead because they have already invested a lot of time in preparation for the climb, it is called sunk cost effect, a mind glitch; --something we humans are prone of every now and then. The result, 8 of the climbers were killed and several others were left stranded. 3. Biggest payday - Everyone on his team and even the God fearing Manny Paquiao isn't exempted on the allure that it will be his biggest payday. Will he ever get another chance on this in his lifetime? No one in his right time will ever think so, he is thinking, this is the one and only one chance he would get this opportunity in his lifetime. PS. that type of shoulder injury isn't a joke. I had that injury, and you can move okay, punch, shoot with it okay at certain angle and position, sometimes you think you're fully healed, but once you hit or stretch the wrong spot, then, there will be this sudden huge surge of sharp pain shooting up. It's too painful, and believe it or not, this can be a legitimate reason to end an athletes career for good.