Justin
have you done this? or is it a guess? you would think the 10 that bought this season would have zero'd out when the season started. i'm not throwing 10 more in 5 weeks before the season ends, in case others win some to contribute.
I bought 20 boosts and put all of them into the league. When the season gets renewed it just takes the amount for the highest possible boost.
E.g. if you have 20 boosts it will use 10, boosting the league to gold. 10 will remain in the league’s inventory.
If you have 4 it will use 3, boosting the league to bronze. 1 will remains in the league’s inventory.
If you have 1 boost it won’t be used up until there are sufficient to boost to at least bronze.