I see it this way. IF you didn't bring in your team. Then they would have to invite 5 other people. So I don't see why you can't roll as 5 different people would.

I see no need to pass on loot. Repair,consumables, etc costs a ton. And your ONE person providing for 5. Which IMO alone gets 5 rolls. I see no reason what so ever it should not be this way. It doesn't matter how many people are behind the toons. It comes down to the fact you are helping the raid at as one person but with 5 toons that are doing what 5 other people would do.
Now I do agree with the healing/dps issue. If your not holding up to par then its up to the raid leader/gl to decide. But if all things are going like they should and your holding up to what needs to be done. Then I say roll x5.

I know when my teams get into raiding. Eachone is open to loot. As eachone is its own toon. May be controlled by one person. But its either one person who knows the fights or 5 nubs who have no clue.
But thats me. I'm not a loot hog. As I could care less over all. But I do like the chance to at least say yes I want it or nah its not big enough upgrade. I don't like others making the decision for me. I'm not a child and need my hand held. And will not accept it while playing a game either.

I just recently left a guild because the Gl who was a HORRIBLE healer. Took 3 pieces. Without giving the other 5 of us healers a chance for the items. She decided she was going to take them. And of course it was talked with the officers which NONE are healing spec and didn't care. This to me is ninja looting. Its taking advantage of the other people that are there just to gear yourself up.