what new some
You really don't seem to be getting this, so I'll explain some simple facts for you in plain and simple English.
1. A sig "file" is something tagged on the end of every single post a person makes. It often contains a quote, or some information about them - location, cars they own, etc. Some people modify their sig depending on the group they're posting to so it's relevant to that group, whereas other people put a whole load of stuff in. It's just a brief insight into that person, that may possibly spark off conversations, just as someone wearing a souvenir t-shirt of a band's tour or music festival would do the same thing.
2. Mentioning cars owned in a sig isn't someone "shouting about what pooheaps they drive in every single post", it just does what I already mentioned in point 1.
Cue the Jokes... 326Silk Well I do do it, and it's still no problem. There is probably some truth in that although the risk is so small I'm not inclined to worry about it too...
3. WTF's wrong with a long-standing regular poster to a group announcing a sig change. It's just another way of initiating a conversation. There's no real practical difference between saying "I bought a new Skoda", and "Sig Change", with the details of the new car in the sig. What's the problem with that?
-- "For want of the price of tea and a slice, the old man died."