I think he's doing the right thing.  Don't be so hard on him.  If the tables were turned could you be subjective enough to gauge the quality of your husband's posts in this type of situation?  

I think it's a lot like the ethics training I received at work; what constitutes a conflict of interest?  What would it look like from the perspective of an outside observer?  Could your husband justify his action and convince us that he does not have a conflict of interest by giving his wife merit?  Quite the opposite, your income (and therefor his indirect income) would be enough to claim he does indeed have a conflict of interest.