It went like this with my last negotiation:
Ironic : $850
VC: $350 (what the freak???!!!)
Ironic: $849
VC: $450
Ironic: $815
VC: Deal!!!!!
LMAO

Don't let them shove a price on you. If you are persistent, they will accept a price close to the one you initially set.
This is completely crazy!
I wish I had known this before I accepted their second offer for a bag.
I put all of my listings at a low price, because I just want them out at this point, but I don't want to give them away completely. I think VC is more sensitive to price than to condition for their items (which is odd because many of the items on their site are overpriced). Two of my items had some noticeable wear so I had to list them as "fair" condition (Hermes CSGM with a run and Hermes HAC with corner wear and strap wear), but I listed both at 50% or less of retail and VC had no problem with the pricing. On the other hand, I had a like new $1K dress that I listed at $195 since I know it is hard to sell clothing. They proposed $99, which was disheartening, but then I realized that it was not worth battling over $100, so I just agreed to that. I also listed an almost perfect and really cute seasonal flap (with it's box etc) for $1595, which I thought was a great price. They came back at $995!! I couldn't go along with that one (I think they must base their price on their "categories" and they do not have a category for seasonal flaps, so I had to select "other"). Anyway, I came back with $1450 and they suggested $1300 and I just agreed. I should have held out for closer to my original price!
Another VC listing tip I picked up on, though it is exhausting, is that if they keep rejecting your photos or even if they reject your item, don't keep trying to edit the same item and send new photos. Just start a new listing with the exact same item and photos. A different person from VC will view it and they will likely accept it. I bet this would work for price disputes as well.
I listed 6 items total. 2 were accepted right away. 1 required different photos, then it was listed. 2 were rejected once, I listed them again with the exact same photos and description, and they were accepted. 1 item was rejected twice and then accepted the 3rd post! No explanation of any of this from VC. It's like yelling into a cave.