Higher rolls were not used in calculating winnings.
They were set to be included in the session.
See snapshot below:

R Deltã: Type /roll 100000
Flibblet rolls 37899 (1-100000)
You gained: 6 12 16
Zarðan rolls 41845 (1-100000)
Elluminax rolls 21243 (1-100000)
Rethorian rolls 68006 (1-100000)
Hardhitty rolls 8123 (1-100000)
Bedisia rolls 9046 (1-100000)
Kylebusch rolls 10569 (1-100000)
R Deltã: Hardhitty owes Flibblet 29,776 gold!

this doesnt tell me if the highest rolled was even included in the game, they might not of been added when they said their "1"