"Trade stardust cost punishes generosity"

#PokemonGO: I've gotten a few lucky friends with casual players now, and I'm seeing a pattern where the causal player I'm lucky friends with doesn't really have anything I need, but I'm happy to share my extra shinies and legendaries with them. However, I can't say I'm really happy to have to pay 40,000 stardust for the opportunity to help someone else out. I'm realizing that I can't keep doing this as it's too expensive, but I don't want to be selfish either. How are others handling this? via /r/TheSilphRoad http://bit.ly/2UJx18J