Just wanted to throw an idea out there that may be an interesting one to think about, and also may help increase interest for doing raids and such, even after you've collected all the weapons and armor. Keep in mind its a rough idea not necessarily a balanced one, just a beginning idea that could be massaged a bit. The idea would be to have a component that upgrades your current Ghost. The idea is to have each ghost have a very specific trait based on where you received the Ghost. So, lets say you get an unique Ghost from Crota; then lets say that Ghost's trait was "increased damage resistance from Hive" or specific "Hive Knights". The more you kill Crota your Ghost's experience increases, possibly unlocking additional traits, much like it currently is with weapons and armor, but to unlock all the traits you'd need to do this by completing the challenges, which could consist of killing Crota and /or killing Death Singers "X" amount of times. The final trait would be the reason why people will continue to play raids. This trait would only activate after the full completion of that Ghost's raid (where you got the upgrade) and resets each week along with all the other activities. Whether it's super powerful and replaces heavy ammo, such as your Ghost 3-d prints you a sword, relic, or scorch cannon, once during the match (duration and/or ammo count drastically nerfed), or may something like your Ghost's cruises around with you and shocks people with a laser, or has a trophy system blocking nades, but doesn't affect heavy. Could be a scorestreak as well. Just a rough idea to ponder around.