Another advantage to trading for guys that have been in the league for a while is there is generally a learning curve for WRs, meaning their first couple of years in the league are generally less productive. A great strategy is to trade unproven guys like a Meacham, Sidney Rice, or whoever for a Mark Clayton or Santonio Holmes-type- a guy who came into the league with a lot of hype, has shown flashes of being a solid player but hasn't proven anything, and who is entering his 2nd or 3rd season. Even if both WRs (the one you traded and the one you got) wind up following the exact same career arc, you come out ahead because you don't have to waste a roster spot for 1-2 years while the rookie WR develops. Plus, if you are really interested in Meacham, you could always trade back for him after he's been developing on another roster for a year. Owners tend to overrate this year's rookies and underrate last year's rookies.