In the last event, … the Haloween, … I did 450+ pulls and got all the 5* heroes the event was offering … Alice, The Hatter, 2 Queen of 
… 8 Kunchen … 7 other 5* heroes, or was it 9?
I have more than 130 5* heroes including dublicates of two three four and five … and I will continue to farm them as new ones comes.
PAUSE
To answer the question on the topic title … I will say …No.
Not a single bit!
Thanks.