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 2015-02-25 13:48:48