Pretty easy answers.
Eagle is junk. Period. You can't compare castings between two different manufacturers and call them equal just because they're both castings. I wouldn't use an Eagle product in my lawnmower. There are more than several threads about Eagle FE cranks failing. The ones that you find on Scat are very few and far between, and even then, I personally haven't seen one that wasn't caused by lack of
oil.
You will not find an Eagle part of any kind in my shop.
Why is the margin higher? It's not. The profit margin is the same, but the profit is higher because it's a more expensive part.