I thought I understood consumers, but now you have me doubting myself. Human behavior is fascinating.
We definitely wouldn't sell something that we wouldn't want to sleep on ourselves but I can understand your concern with sleeping on something that isn't 100% natural.
If you're concerned about sleeping on foam then you might want to take a look at a more alternative option. Look for 95% natural latex foam (there is no such thing as 100% because they use glues) or for all organic cotton/wool tufted cores.
b.) people naturally sweat and have oils in their skin that get transferred through sheets. it's normal to have discoloration where you sleep. that's another reason a mattress protector helps (easier to replace a $50 cover than a $$$ mattress).