For quite a while I viewed the forum without registering, although I obviously wasn't doing so 24/7. If there are lots of people doing the same then there will be a number of guests at any one time.
In the 2001 census, Stafford had a population of 63,681 so six people reading about their own town isn't that many. Plus there will be a few people from outside of Stafford who are interested and have connections.
That's my guess, anyway!