Well for one, I never considered playing multiple spoils in a single game.
In much the same sense, casting multiple consults in a single game is way too risky for such a deck as dragon is.
Dragon.dec, unlike other combo decks, thrives in redundancy and not explosiveness.
As such, a well built dragon deck would miss 1 or 2 combo pieces in hand most of the times, barring disruption and counterspells.
This ultimately overshadows the "additional" benefit that Demonic Consultation has, being able to be cast in multiples in a single game.
Maybe you should've tutored for Bazaar in the first place.
That way, you would just be "digging" for whatever you like and not desperately tutoring for it.
Next, arguing that running multiple consulations is better than multiple spoils is kinda pointless.
DC is restricted ya know.
If anyone here plans in running them, planning on running more than 1 copy is plain wishful thinking.
If the purpose, however, in your post is to emphasize the uber brokeness of consult, then let me tell you that yours truly was a pilot of both Necro deck in black summer and UB Donate way back in extended so don't bother.
I echo your feelings about spoils going horribly wrong being more of a personal killer than a "miss-consultation", however.
I personally dropped the spoils and switched to +2 tainted pact, +1 random metagame card, since they're (spoils) just being SB'd out 100% of the time or I often just don't have the guts to cast it in an actual tournament and loose.