Sir Derf
Adept
Offer 110 Marble for 6 Dust is a ratio of 18.3, which is better than 16:0, but is only ranked at 2 stars.
Offer 220 Marble for 12 Dust is the same ratio of 18.3, which is still better than 16:0, yet this is properly ranked at 3 stars.
My guess, the math is integer based and testing if (110/16) > 6, and is truncating the 6.875 to 6, !> 6, while (220/16) is truncating 13.75 to 13 > 12.
Offer 220 Marble for 12 Dust is the same ratio of 18.3, which is still better than 16:0, yet this is properly ranked at 3 stars.
My guess, the math is integer based and testing if (110/16) > 6, and is truncating the 6.875 to 6, !> 6, while (220/16) is truncating 13.75 to 13 > 12.