Display country (by IP) of posters

I've been buying content creation services in the BST forum quite frequently over the past few days, and have discovered on more than one occasion that the seller is not actually from the country they claim in their post. The reason this is important is that the content I'm am after is for quality websites; and receiving broken English from someone from a country that doesn't even use the Latin alphabet, that claimed they were from the United States, is a waste of time and money.

I understand that it will create a little bit of extra server load and could be bypassed with a proxy, however I hope you consider my suggestion.