My, what a scandalous title for a discussion. If you are one of those folks who spend a tremendous amount on gear that you then take out once in awhile and state "look how nice a camera I have!" and once in awhile get out and take photos that you think are awesome but are really a waste of a perfectly good hard drive then yes, I can understand your anger that a few individuals who waited awhile managed to find a deal online.
As someone who actually uses my 5D3, I certainly have no remorse. Since picking my camera up in the beginning of April I have taken over 20k shots, travelling with it to Dubai and Tuscany and getting a number of shots I would have had no chance with on my old 5D2 or 7D.
If I wanted to I could easily sell these shots to make up for the drop in price. Seriously, rather than concentrate on discussions like this, just get out and photograph.
Even worse, the price drop was "One Day Only."