Milk and meat, as prohibited foods - where does the prohibition against benefit for in, or does it? The comparison to orlah, and why they are different, may be most significant. Also - "for medicinal purposes" will excuse and allow a lot of prohibited-for-benefit items. But not the Asherah. Which brings us to the Big 3 - mitzvot for which one should martyr oneself rather than transgress. Plus: What if you get benefit from something prohibited for benefit - against your will?!