When i said the above, and reading your comment again... The first thing that came to mind:
This might not be great from a responsible gaming point of view. Ok we did do some calculations with our volume and the promo just adds a little bit to the RTP of the game (if 100% of the players claim their reward).
So after
@Jono777 I was thinking: we might move players from their comfort zone (given the bet size) to an uncomfortable zone.
And the problem is: if you hit big while playing with a bet size you feel in general uncomfortable with, after a big win this will become your default bet size. While your salary or gaming budget might not even cover that.
I think it's better we switch gears and offer these challenges on various levels !
Well done Jono!!!
Kr. Jan