Your passport is NOT your property...

property of wikipedia
So whilst you are on a trip to Thailand

NEVER submit your passport

Take a photocopy of your passport with you and 
feel free to hand this over if it is requested.

BUT then who does request it?

 When you rent a vehicle to drive...

Don't rent a vehicle - too many accidents....

BUT if it is not a property WHY do you have to pay for it 
and / or 
get a refund when you pass away?