It may be a 1.8m difference, but people are willing to pay that difference. People want the best and will pay for it. You can also see this trend with the 4.8m difference in the price for a fury. People want it, they will pay for it. Plus, the price difference may make up for an extra 3-7k xp per hour, which may not seem like much, but when you train mindlessly for 10 hours...that's some xp you are missing out on because you chose the scimmy over the whip.