Trading Places/Fridge

Fridge Horror

 * As the Dukes discuss their wager, which means ruining Louis' life and raising Billy Ray to take his place, Randolph says "We've done it before. This time, it's in a good cause.". So how many lives have they previously shattered For the Lulz before this?
 * And what did they consider a bad cause?
 * For that matter, while the Dukes have their fate coming, Winthorpe and Billy Ray also take advantage of other commodities traders, who notice the Dukes' plans and try to profit, too. How many others got bankrupted in their revenge on the Dukes?