BANGKOK-Thai police have arrested 18 people and seized luxury goods after receiving nearly 5, 600 complaints about an alleged pyramid scheme, saying on Monday they estimate investors have lost at least 1.61 billion baht($ 48 million). The Central Investigation Bureau( CIB) said it had seized assets worth 225 million baht, including 29 cars, three houses and luxury watches, from the alleged perpetrators, who have been charged with defrauding the public and violating the computer crimes act. Polic