jw23 don't quite understand why you would overstay your visa, seems a bit stupid when it is so easy to get extensions. And if you did the same in Indonesia, you'd have the same problem. And if Filipino did it in the UK, well the probably wouldn't see the UK again!
As for corruption, being conned etc. Well if you don't know the language, don't know the culture and walk in put your money down, its very easy to get duped. You'd probably find the same problem in any of the South East Asian countries... sorry if its a bit harsh, just the way i see it.