Frostwolf's curious gold market

Anyone notice anything funny about these gold prices on the website?

https://imgur.com/a/UsaZC

As long as I can remember, you have been able to get 19,999 gold for 2 coins, but if you want to buy more gold in one transaction (instead of just waiting a few seconds and making another 2 coin purchase), you have to pay more per gold.

What is going on here- are people really dumb enough to buy more than 2 gold at a time at these prices? In every other market situation I know of, you get bonuses for buying more, not penalized. Seems really bizarre, but it's always been that way.

They discourage gold selling, in the end they remove more coins from the market