I can't believe this discussion is still going on....
If raiding, having difficulty clearing the content, or if the healer is just standing there with nothing to do, then yes DPS, but I fail to see why anyone is kicking healers for not doing damage on roulettes when it will save maybe 5-10 minutes. People apply raiding principles to casual content in this community far too frequently and its very annoying. If you don't like casual players not following the meta, don't run casual content, or do it with your like minded friends.