I think to get more interested in more kills>>>Each Global have a number(other than top 100) that gives an extra chest, maybe 2 chests.....for example players between 10k and 10.2k kills get a chest. this could be refined as it`s just an example.
I like the idea of giving a chest to players that achieve XX,XXX amount of kills... i think this number has to be achievable by players with low max stamina and little access to global booster as players with little to no disposable income should get something for maximum effort.
I believe the number of kills should be set by the Cows as they set the event time limit they will place so they would know how much stamina can be gained during the event and what effort would have to be placed by avg players in FS. I like a number closer to 20K then 10K.