That same concept Bowman and CI mentioned works out very well for Illinois. Every BOW tag in that state includes tags for 2 deer. One says either sex, the other says antlerless. They are unlimited in the number you can buy. (You are only allowed 2 bucks in IL regardless of tags possessed...this includes landowner tags, bow tags, gun tags and ML tags.....2 bucks max per year per hunter) The cost there is $26 for bow tags. Here in IA, the DNR will not lose out on the money if the folks never buy the tag and it is lost opportunity for the DNR to reach the goal of population reduction.
Me personally, I know I would be harder on the does in my area if the antlerless tags were dirt cheap but I would also pay more if needed to get an either sex tag.
My thoughts on earn a buck....great idea but you would have to implement check stations for accountability which I doubt would happen. If no check stations, how would the DNR determine who is eligible for a buck tag and when?????