You're right, In such allocation bounty hunters can get handsome amount of rewards undoubtedly, If Team and Bounty Manager planning to pick the real hunters in their promotion. But i see few BM didn’t made the rules that's why most of the time hunters got payment and end of the day transaction fee is more than Bounty payment.
Now every bounty hunter can directly make calculations in general or roughly on each bounty Allocation that has been listed on the bounty page with a predetermined time duration, so that if it is considered to be very suitable with the payment that will be received when the bounty ends, there will be many hunters entered the bounty.