[EpicDice] 為什麼EpicDice的獎金池常常是滿的？
不不不，今天不談賭。談數學。
題目是：為什麼EpicDice的獎金池最近常常是滿的？（獎金池注入後上限是300 STEEM，現在常常是滿的，或是接近滿的）
先說一下，獎金池是用EPC token來下注時所可以獲得的STEEM即時數量總額。
也就是說，這是賭EPC時用的，跟平常下注用STEEM沒有關係。
下注EPC的規則是：贏的時候，按照內部價格（目前是100k EPC = 1.117 STEEM）來賠，並且扣除5%的EPC。輸的話，很簡單，下注的EPC都燒毀啦！
那麼到底為什麼獎金池常常是滿的呢？
讓我們用一個例子來試算：下注1,000,000EPC，賭高於50，因此機率是一半一半。
- 如果贏：下注金額相當於111.7 STEEM，賠1.96倍，所以是 111.7*1.96 = 218.932 STEEM，但是損失 50,000 EPC
- 如果輸：1,000,000EPC，ByeBye!!
目前，50,000 EPC市價相當於是 8 STEEM
因此，期望值是：( 218.932 - 8 ) * 50% = 105.466 STEEM
1,000,000EPC按照市價換成160 STEEM，賭局期望值只有約105.5，不太有吸引力。
不過，原本賭博就必然是負的期望值，我們這裡要檢驗的是用不用EPC來賭。
所以，要對照1,000,000EPC按照市價換成16 STEEM來賭會如何？
- 如果贏：下注金額160 STEEM，賠1.96倍，所以是 160*1.96 = 313.6 STEEM
- 如果輸：160 STEEM，ByeBye!!
期望值等於：313.6 STEEM * 0.5 = 156.8 STEEM！！明顯高多了！
所以，自然，沒有人會想用EPC去賭囉～～～
這裡頭的重點就是：EPC市價高了，代價上升，自然就不划算了～～～
噢，對了！EpicDice剛剛完成EPC之前承諾的空投，總共發出1.5m的EPC，價值150 STEEM喔！
https://steemit.com/dice/@epicdice/airdrop-of-1-5m-of-epc-worth-at-least-150-steem-is-completed
如果錯過，下次一定還有機會的！
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重點是...沒人
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