Terry I'm sorry you have such a low opinion of MV enthusiasts. But people can be helpful if they know there is a real problem, you will recall you spent half a day at my place when I sorted out your ignition problems but at the time I didn't know you from Adam. For all I knew you could have also owned a Jeep & a GMC
I carry a large bag of electrical test equipment with me to most shows for the explicit purpose of helping people with electrical problems. The last time the bag was in action was to help sort a problem on a WW2 vehicle.
It is inevitable that people with similar vehicles of similar eras will gravitate to each other. Very often they have been seeing each other at shows for years. It easy for someone new to the scene to feel excluded. Not because of active discrimination but people in clubs & groups of any sort are not good at recognising newcomers. But that first show you went to I only knew about half of them by sight, but there were several people new to me who I ended up talking to.
Other than at very small gatherings, you are unlikely to get vehicle owners going round introducing themselves to someone they haven't seen before unless they happen to be parked next to you. I doesn't necessarily mean they dislike you but they may not be drawn to your vehicle because it holds no particular interest for them. All our interests are different, on another thread someone said that a shedfull of tanks was far more interesting than a shedfull of Land Rovers & Bedfords. To me the attraction is the other way around!
I think you may have given up a bit too easily