Some collectors do collect multiple copies of items they like. Now why one would choose to sell each at teh same time is beyond me. I think it would hurt the value. For example, I have multiple white Estranged white test pressing cds. But if I sold them I wouldn't list them all at the same time!
Did you outbid me on the one Steph was selling a few months back? (eEbs I think was the usernme on here)
And yeah, I have two copies of the White. I may pick up a Suicide since I still don't have one...