I'm referring to the fact that I was told at booking that I would have to pay $100-$150 for a change fee plus the difference in fare. Changing the outbound leg is a $93 difference in fare. I was never told the entire ticket would need to be repriced.

You mentioned it is standard practice to reprice the whole ticket. Can you site some source for this? I'm not saying you're wrong, I have just never experienced it and don't expect that, so I don't see how a customer can be expected to just know this when an airline's web site shows prices for each leg separately, leading the customer to believe one leg can be changed just as I have.