I have been to two artist festivals this summer with dozens of artists and hundreds of paintings on display (mostly oils). Of all of those, only a very few were varnished. The rest appeared unvarnished or if they had matt varnish it was impossible to tell it was on.
A lot of the paintings were for sale and must have been transported so I was surprised that nearly all weren't varnished.
Does anyone have any ideas why this was the case? Maybe it's not the 'tradition' here in the UK, or is there other practical reasons I'm not aware of?