I don't think it's a terrible idea. I main a Titan and I have almost every piece of exotic armor so I usually only run it once or twice but on my warlock and hunter I run it much more because there are still plenty of exotics I want to chase. I was running it yesterday on my hunter with a couple people and it actually got to a point I stopped getting exotics or shards. I ended up getting 3 prisms 1 run then the following 2 I literally got 1 prism. So I stopped figuring my luck stopped. After about 8 runs I still don't have celestial.