The rules for an O visa say the money you are required to put in a bank account must be spent in Thailand. Does this mean that they will block transfers or something? How do they enforce their rule? My reading of the rule is as follows: "You may be planning to live cheaply here in Siam, buddy, but we're going to do all we can to force you to leave your money here. So don't get your hopes up!"

Correct me if I'm wrong!

And how do they enforce their rule? Simply by refusing to extend your visa if you break the rule?