I tried farming the last one one day and never got the koban reward. After that, I figured it was probably too low of probability to be worthwhile and am ignoring it. Maybe I'll give it another shot after the soul ticket event ends, or maybe not. Probably not.
The real jackpot from the event is the EVO emblem fragments, especially the part 3 that was previously unavailable. So far, I've gotten 3 of them in as many days, for thus far a drop rate of 2%. With those unavailable elsewhere in the game, you don't want to miss that just trying to farm koban that is available all over the place.





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