I wish I didn't have to hack this in every time I update this plugin :)
Check out the way I changed the tiered pricing list to show my a pretty list when I give savings for 2, 3, 4 or 5 items ... not hundreds like this system is set up to do.
By the way, I crudely added an indicator how much you save with each item you buy more.
You need to edit the file views/default/products/view.php