I see plenty of reasons. Everyone he has encountered on the island is either a sociopath or a psychopath. Sure, he might die somewhere out at sea.. but isn't freedom worth the risk?
Buddy, trust me, we're (Doms) doing great. Beautiful slave girls and sexy female assistants and servants who bend to our will. KaneDom lives in a luxurious mansion, drives a Bugatti Veyron supercar. This guy has fucked all the Karlsson sisters and half of the JF staff, that is, all those elite women who diligently portray themselves as dominatrixes, but in fact crave real strong-willed men, a strong male hand and a powerful cock, which they gladly worship..
KaneDom has huge career prospects, the opportunity to create a harem of elite beautiful and super hot women, including lovely Olivia and the other Karlsson sisters , who again will be subservient only to us, and even bigger opportunities to build more serious romantic relationships with them...We'll also have a T1 level romance (the highest level of relationship depth, the same as the Karlsson sisters) with hot redhead Amazon Angelica... There are other hot chicks who will settle for less, just so long as we fuck and own them by taking them into our custody.
In the not-too-distant (by the standards of in-game events) future, we can already see glimpses of the shining Throne, which one day will undoubtedly be occupied by the well-groomed, successful and respectable Kane, beginning to rule the Karlsson Group and half the world. All the most beautiful women want us, shining empyreans of power await us. All we have to do is not screw up and do our job right. So why should we run?