I have a car related consignment story. A friend of mine had a fairly nice Buick Grand National. Nothing special, but solid popular car. He didled around for a few years getting it in top running condition. Well one thing leads to another and soon he's married with a little gearhead on the way. He decides to sell his GN. Tries to sell it himself with no success. So he takes it to a local classic car lot. My friend would have happily sold his car for $10,000. The car lot guy puts on the full sales pitch to buy the car for $5,000. My friend turns him down, but agrees to sell on consignment for $11,000 or more with my friend getting $10,000. Well needless to say, the car languishes on the car lot for 6 months. My friend gets antsy about the car not selling and finally gets a call from the dealer where the dealer had told him the best offer he has gotten is $6000 of which he will keep $1000. My friend went by and got his $5000 check which bounced the first time. The second time around it went through. Anyway, a few days later my friend was driving home from work and sees his old GN parked in a driveway on his very street. He recognized it from some subtle pin stripping he had done to the car. He stopped to chat the new owner up and tell him the mods he had done. He found out the new owner had paid $15,000 for the car. It turns out, that to avoid a lawsuit and possible prison time the car lot owner allowed my friend to keep the $5000 the lot owner had paid my friend and gave him the $15,000 the car actually sold for and paid my friends lawyer fee of ~$5,000.
There are some lessons in there. Pick the one(s) that apply to you and act accordingly.