Negotiating the Spire

From sdcowboy:

Most of you probably already know this, but for those that don't, there is a little trick to negotiating in the spire.  When you hit the negotiate button, the required list of goods appears.  In the lower parts of the spire, these are usually five items.  The number increases as you climb.  I will go into this more, later.  Ok, you have hit the button and know what is required.  First and foremost, make sure that you have enough of the required goods and supplies to cover the negotiation.  I know, this sounds simple enough, but I have (and still occasionally do) enter the negotiations without sufficient goods and/or supplies.  If you don't have what is necessary, you will lose all that you have posted for negotiation. DUH.  

OK, now you know and have the goods.  Start by offering one of each good and don't offer in the order that they are listed, mix them up.  The trick is to offer each of the goods/supplies in the first negotiation try.  You will always satisfy at least one character, usually two.  The goods list will dwindle at this point by one or two items.  Us deduction to determine what is wanted by the remaining characters.  That easy with five items and five characters.  With more than five items for five characters, it is a little more complicated.  But the trick is still to offer at least one of every item, but this time it will take two rounds (unless you are very lucky).  

Remember, offering each item at least once will reduce the total number of items asked for with each round.  And use deduction (what has already been offered and refused versus what items can still be offered as per each character) and you will end up not requiring many diamonds for more than three tries.