Some great posts on here.
What does it all mean?
Really there are at least two very different scenes that like similar music and dance the same. And it's as simple as that.
The dominant one in terms of numbers is oldies based and is relatively commerical these days and has little to do with the aspirations of an underground music scene as say existed in the days of The Wheel, 70s etc. Retro clothes / Baggie trousers, beer towels, Top 500, Frank Wilson and Sandi Sheldon, Wigan revivals, patches and varying levels of memorabilia from the mildly puzzling to the downright offensive. The members of this scene are trying to relive something that existed decades ago.
Then a much smaller scene in terms of numbers that also likes some oldies, but also likes to hear different music too. No fashion beyond casual, little / no memoribilia. Very much not trying to relive the memories of the past.
Both scenes are broadly friendly, and clearly there is a degree of crossover between the two, but let's just be honest and recognise there are two different scenes here with a completely different outlook.