Some people are actually starting to think about that, especially in the context of insect "meat". For example, a cow makes ~250kg of meat, a cricket weight ~0.5g. If you believe all life to be equal, eating a cow is 500 000 times better than eating the equivalent in crickets. If you believe that insect are worth 10 000 times less than cows (arbitrary number), that's still 50 times worse. I think it's important that people come to term that there's no magic way to avoid all suffering, and that they start thinking about what their values are.