Gentlemen, this is always been something of an interesting if sometimes contentious topic, and as is always the case when it's discussed this has been and remains an interesting thread. It's also illustrated that there are reasons why posting the city is useful but that the practicalities of maintaining accuracy are not simple.
Escorts move between cities, some relocating, some travelling. Their RM ads show as 'current location' what they set it as, not a permanent home base (and they change it, for example, to optimise search results). In an ideal world, references to cities would be kept up to date, but we're not in an ideal world. Moderators will tend not to update titles proactively, but will make some, but infrequent changes. For example, if we combine two or more threads about an escort we will make a judgment call about which title to retain or whether to update it to something more appropriate.
Pinning this thread would imply that it represented a forum policy, and while posting a city is useful, it's not a policy to require it. OPs can change a title at any time, the moderators will change them when we see it as necessary, but sparingly. If you think it's necessary, post it in threads you create. Revisiting this thread periodically sparks the discussion afresh and may convince some members anew of the benefits of the practice.