Djinni's Merchant discount BUG

[daft48eddiex]

I just encountered this BUG........
Used daric to increase the discount.........
Started at 40% of 800 = 480 darics
used 20 daric and increased discount to 43% = 456 darics
used 30 daric to increase further but instead went back to 41% = 472 darics.

therefore have wasted 50 darics to get no real increase in discount as it decreased instead.

Please sort this BUG out.

[dyopet2]

not a good idea to spend more than 20 daric for discount. discount is not counted in your points for rewards.

[Katatonian]

As far as I know its a chance at a further discount, not a guarantee.