Are you considering raiding with them? If you brought consumables and could keep up with the others dps i would say that each shaman should be equaly treated as a raid memeber.

However raids tend to see it the other way, your one guy and in every pug im in they ask me if i want to bring my other shamans. When i reply ofc if i can roll on all of them, and the discussion ususaly end there. Its a hard case, i mean Guild Masters cant seem to agree with themself if they should invite all of my shamans or just my "main".. Its not like it matters to me if they are all inside or not!

Do you feel your helping the raid or just slowing them down? I belive the answer lie there.