Yeah I suppose it depends on where you live, slot machine, one armed bandit. Fruit machine here in England.
Correct, you can also mark games as broken and in bigbox there is a checkbox to hide broken games, so you will never see them again if you don't want to.
There should not be game videos in Launchbox/Videos it should go Launchbox/Videos/arcade/ If you don't want the video you can just delete it, by the sounds of your description you are talking about critical cids mame videos which are downloaded from emumovies if you have a premium account there. But again all your arcade videos should be in Launchbox/Videos/Arcade which should have all the normall videos in it as well as another folder called themes where the fancy ones should be. Like this. Also in bigbox is a option to prioritize "theme" videos turning that off should use the default videos not the fancy ones.