Ratio among Bitcoin, Ethereum & EOS

I have recently noticed the fact by chance...

The price ratio in KRW among BTC - ETH - EOS is almost alway constant at 1000 - 100 - 1 as you can see the screenshot below. This sounds ridiculous to me because the price is usually set/determined by sellers' supply and buyers' demand in the market, which is so called "market value" or "market price". In case a certain ratio in between coins is fixed for a long time in crypto market, I think there would be some problems; it has zero sense to me. Please make me see reason if anyone knows this answer clearly. Thanks!

얼마전 부터 문득 알게 된 재미있는 사실은...
빗썸 거래소에서 비트코인 - 이더리윰 - EOS가 정확히 1000 v. 100 v. 1 로 계속해서 움직이네요.
수요와 공급이 만나 거래가 이루어지는 시장에서 어떻게 이 비율이 오랜시간 유지가 될까요?
잘 이해가 안됩니다. 혹시 이유를 아시는 분은 공유 좀 부탁드립니다.