Thaksin's accumulation of wealth is well documented.
Some good business deals, some dodgy deals - some outright corrupt. Must have Chinese good fortune as he made a shed load when selling Manchester City (after being deemed by the FA to be an unsuitable owner).
"Thaksin, who made a £120m profit by selling City, may now try to sell his remaining 10% stake in the club as tries to build a new life – he is reported to be building a £5.5m property in China – and fight Thailand's extradition procedures"
https://www.theguardian.com/football/2009/feb/10/manchester-city-thaksin-sacked