I get that most of his family didn't care for him but surprised he left without telling his mother unless he was just adult enough to live on his own soon anyways
A kingdom for slaves to live freely... supposedly created by buying said slaves...
Sounds like a huge money sink.
Also, if it was on an uninhabited island, I'd maybe buy it but just creating a country out of thin air on some random plot of land... you'll need an army first and foremost.