Never played one.
A combination of time and money (or lack of).
I was tempted to play in one at the Oxfordshire years ago but didn't.
The thing about them mate as its a good way to get cheap golf and play of the back begs,the St Andrews one is £23 with a 2 course meal the green fee is normally £65 the Forfar one is £12 you cant get better than that.
Good value for sure. they don't seem to be advertised round here much. Can't say I've heard of any or seen any notices. BUt then round here you have belong to one of the "proper" clubs to go in fo that sort of thing...
We even have a list of all the opens in the Highlands in the local paper The Inverness Courier at the end of March each year, Its in the form of a full page pullout. I think the P&J do it as well.