It is surprising the number of Posts I read where if I replied, the advice would only be relevent if the original poster lived in the same country as me. I therefore sometimes do not reply if that information is missing. This is especially the case if someone is asking about the best price for a product or where a replacement part can be purchased.
Whilst I realise that a lot of people like to remain anonymous on the Internet, I think it would be helpful if Posters included at least the country where they live in their personal details. This of course is not a requirement, just a suggestion.