There is an interesting discussion about ethics currently going on at MobileRead.
link
When I read a person's comment that seems out of place I look for where they are from. (For example, the copyright laws are different between the UK and the US.) It would make it easier for all of us if more people would add their location to their profile. A lot already have and this helps a lot. I remember one thread about the shipping costs for a Sony Reader where the person asking did not identify where they were from. That was a hard one to answer.