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Sparks can be used to promote the bots. Just click on the astrotrain-icon in the lower right corner of your screen and select a bot. Then click on promote. (Sorry if this is already known to you). Then you can promote this bot in steps of 5%. This can be very useful when running events (and even a spark run itself) with this bot. Your score will be increased (bonus) by the promotion value of that bot, giving you the chance to end up higher in the daily competition of events and acquire more tokens. These can be used to “buy” several accessoires, get a new kind of bot, upgrade bots quickly and yes, even to get extra sparks.
A list of sparks needed for this promotion bonus is shown below.

Actually the max. level is now 160%, but I don’t know the number of sparks needed for this.Correction: The max level in the spark runs is 160. The max bonus is 140%