Holmes is our $50M receiver, teams don't have two of them. You get multiple receivers by drafting them. Roddy White is on a big contract, Julio Jones isn't. Antonio Bryant got the big contract in Pittsburgh, so Wallace is probably gone, but they have Sanders waiting to be the #2 guy when Wallace walks.
We have Holmes, who's not really a #1, and drafted Hill, who's at least a year away from being a consistent contributor.