Location on wanted posts why is that necessary?
Having a location on a Wanted post does help people to see if they are local. Also, for a small item it might not be worth the fuel to travel too far to collect it, (although it is possible to use the postal system). Members make their own arrangements about this. Knowing the location at the outset can save pointless inquiries.
Having a location also assists in spotting 'Cross posting' and any potential traders/resellers. It also serves to enable mods to inform members about their most local group, as appropriate. If all posts require a location, members seem to remember to do it!