As a Thai, Most modern Thai woman I know , the educated woman, mostly don't even care about sinsot (they said it's hard to find good heart person already why to require more). Me included. Mostly it's elder in family that asked for sinsot. The understanding family will never asked for dowry but would ask a man to take care of their daughter well.
In Thailand, Thai people as Buddhist mostly are taught to give and donate to other so that person will receive merit after death. And also when they donate to these group of volunteer(as foundation). They can get benefit of double expense in accounting