I'd say bv=1/2it+1 is better.
this is nonsense. You wont need a formular when every bonus shall have a value of "1".
EDIT:
I guess youve meant bv=(1/2)it+1 or bv=0.5it+1
in this case I would say that the gap between big and small bonusses will turn out to be annoyingly unballanced in the end, as well. though, it is pointless for this map.
Edited 2/25/2015 13:48:48