"Many electrons have been expended in the discussion"
I think they've been moved around quite extensively (which is odd because on the whole it wasn't the electrons that were unhappy), but they've not really been expended.
(Although you may argue from an electron/hole point of view that the electron and hole have annihilated in some transistors and diodes, it's really a matter of bookkeeping more than actual annihilation, since the hole is an absence of an electron.)