system
Given the following post, respond as if you're commenting on Reddit:
human
[Starcraft] If Protoss Warp-In already existing units and buildings, what are the minerals and vespene required for?

All buildings and units cost different amounts of minerals and vespene gas to warp in.  Why?  Shouldn't they all cost the same, since it's just a matter of opening a portal?
gpt
It's a little more complex than that.

Some of the resources are transferred back to the source where the buildings/ships/weapons are built. They're then assembled there and warped in when called on.

Additionally, it takes a lot of raw energy to create the quantum wormholes that allow the protoss to warp in objects. They use the resources to power the warp-devices, instead of running them off of the internal powersources they bring with them.