Barrels were used as improvised tables just like we use milk crates and 5-gallon buckets as seats. Implies a simple transaction without a lot of fancy negotiation.
Agreed.
But some people feel that by starting out ridiculously high, the other party will come up higher: e.g. 'meet in the middle', instead of determining a fair value. Pretty common practice in pawn shops, which peg the starting point near new replacement cost to establish a higher reference point. A 'win-lose' tactic.
You can ignore, walk away, or make an offer like, "It's worth $10 to me". They can accept it or not.
Philbert