I was responding to your statement: "Think of them as a private business when it comes to financials." A private business would be able to set the cost of its services.
Right, you were responding to a statement which is somewhat inaccurate but if corrected would in no way change the argument I was making or its validity. That's my point.
I'm not challenging your first or second sentence. I'm challenging your third sentence. I'm not sure where you got the idea that I was challenging your whole comment, when mine referred exclusively to the price of USPS services.