Are you referring to upgrading the lower-quality buffs into their higher-quality equivalent? I guess I could see there being some value in a champ with a passive effect that does that automatically - though there's pretty much no reason to using the lower-quality-buff-placing champs, and this would probably not give you any more reason to do so.
Yea if you had a champ or more so an accessory type that could have a chance to upgrade a 15 CR buff to a 30 CR buff, that would be fairly cool. Just running infinity team without Lanakis and thought it would be great if somehow it could RNG an upgrade ... Just thinking outloud here :D
Maybe one day they will offer an ore where you can roll for that upgrade.