It's not like the Cs gave up a king's ransom to get Lee. They traded a bust late first round draft pick, which was a net gain, since they didn't have to give him his guaranteed $1m this season, 3rd/4th PG ET Moore, and a second round pick.
If the Cs can package Lee and Green and picks for someone like Al Jefferson, I'm all for it. Guys like Lee can be picked up every summer, for the MLE or in many cases less. JR Smith signed for $2.5m this summer, Mayo for $4m, RA for $3m, Belinelli for $2m, CJ Miles for $2m, Grant Hill for $2m, etc etc. It's easy to get a bench SG as a FA for cheap money.