If you do that, 1) you'll be unable to buy back significant sums at any one time, and 2) a good portion of the gold you will use will be shared with your knights.
Less than ideal.
eh.. what on earth are you talking about.
silly prices, so no one will be buying it. ever. no gold involved at all.
the idea was that, just like manual offer to buy food, where you plonk down gold, you can plonk food down and then cancel it at a later date.
in any case it's all rather immaterial, because sticking food on sale doesn't work the same way as sticking gold down to buy food. presumably that's the reason why.