I'm not a fan of allowing bonusbuys for bigwin leaderboard comps, it only favours the people with big bankrolls who can risk the volatility of buying a hundred bonuses etc. Having a no buy rule means you have to actually spin the slots and be aware of whats going on, it also means someone with 200eur with a deposit bonus) has a similar amount of playing power as someone with 2000eur if playing 0.1eur spins etc. More more level playing field.

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cocco already mentioned that there is a bonus buy promo coming next year. and i think it wont be the case too often cause many users dont like it

Would be nice to have some competitions where bonus buys are allowed (not just the hit from base spin). I understand that many are against this but I think it would be a nice change since currently the rules are almost identical in every competition.