Private lobbies are a staple of online gaming these days, especially FPS's. Whether it be for
1. Messing around with friends
2. Playing that kid who talks trash 1v1
3. More competitive games, tournies, ladders.
4. Whatever other reason you have.
Bungie has been relatively good at giving us what we ask for, maybe if we can get a giant thread going, or even better imo, have everyone make separate threads asking for private lobbies. If we can get tons of people posting about private lobbies, and it covers 80% of the forums, maybe they will give in.
Obviously the private lobbies wouldn't count towards any accommodation, bounties, stats (except a separate custom lobby stats maybe), gun/armor leveling.
Bungie, if you have no intention of adding private lobbies ever, can you at least tell us why, or why you haven't up to this point?