Well .... 10 sage hashi frags for "just" 20k cps is ... well .... a big NO CHANCE :D but 4-5 ... reasonable imho. 20k cps is not hard to achieve if you save only for Fukurokomaru combo with stars.

shisui is not worthless in terms of usability. You can still use him in Hiruzen teams, Kushina teams .... But in terms of how outdated he is, Even f2p on my server got those 4 or even 5* due to the fact they are available for months and have been in billion wheels as well as redeem events. But new and good ninjas like edo yagura, jinchuuriki bee, anbu yamato, summer sakura .... those should be available in those events. Either them or ninjas like ... old super rares. Ay, Sus. Sasuke .... or new ninjas like Edo Hiruzen, Tobi, Rinne Sasuke, 6P Naruto ... with less frags even. I would rather get 40 6p Naruto frags for 20k fukurokomaru than get 80 frags of 8 months old ninja ....

:)