DD and I were on The Great Antiques Hunt back in the early 90s. It wasn't a particularly pleasant experience. We were put up at a nice hotel, and the food was good, but otherwise we were just ignored by everyone, only one of the experts actually chatted to us, we were treated like props to be moved about the set, to do our bit, but otherwise kept in a metaphorical cupboard.
I wasn't expecting to be going out and socialisng with them, but the occasional acknowledgment that we and the other couple were there would have been nice.
As I said one expert was nice, he chatted to us as we were waiting while they were setting up the test we had to do involving him and said a few words to us after the test had been complete. The rest ignored us.