There are absolutely grosser things than sleeping in a bed that a stranger slept in before you. But, I wouldn’t pay for any of those things and I don’t want to sleep on dirty sheets. Do you?
I’d like to say I don’t believe that this many hotels failed this small test. But, I can’t say I’m terribly surprised. Do we need one of those little paper sanitation rings they used to put on toilet seats to let you know they cleaned them, except much bigger for the bed?