Rune trader questions... regarding buy back prices

Say the rune trader has a sup vig for 50K.. is there a mathmatical way to find out how much she is buying them for.. so that I can decide what to offer in trade for one? Does the trader perhap buy things at 50% of what she sells them for or something?

Thanks in advance.

The traders seem to be offering around 3/4 to 4/5 of what they are selling for. So in the Superior Vigor case, the trader is selling for 55k and buying for 41k. The average price people are selling Superior Vigor for right now is 45k.

Why don't you try yourself?

If the Superior Vigor is being sold at 50K, and the buy back price is X amount, then do:

X/50000 = ratio

Wait a while and get different numbers, repeat the process and see if the ratio matches up.

Easy.

And just another note, I doubt that the formula is that simple, it is probably a bit more complex, factoring in other things too, including buy and sell rates.

Lazy :-P

Plus i dont have one

You don't need to be buy one. If you have any rune or dye, you can get a price quote on it and then look at what it can be bought for, at the merchant (dye trader, rune trader) and use those numbers.

The rune merchants are behaving oddly. Superior runes of several varieties appear to have only 1 in stock (meaning you click for a quote and they're sold out), but are selling for 270 gold?