eth 4s thresher - 15fg
eth 4s giant thresher - 20fg
eth 0s thresher - 3fg 4s Probability (1/6)
eth 0s giant thresher - 4fg 4s Probability (1/6)
Probability list:
CV-----------------Max=4

4s(1+1+1/6)------else socket 1/6
Thresher---------Max=5

5s(1+1/6)---------else socket 1/6
Giant Thresher-Max=6

6s(1/6)-------------else socket 1/6
you can choice sell me 0s or 4s.