It's kind of funny - in that most of us feel we'll be OK with what we get. However we are all worried that we might send out something that someone else won't care for!
I think if we all stick to "If we would be happy to get it, it's OK to send" we will be fine. My personal problem with smells is my problem, and I'll deal with it on my end so no one else needs to be concerned.
One time I bought some old sewing machine parts online, and they smelled like old sewing machine parts. The seller thought the smell was unpleasant, so they tossed a scented dryer sheet in the box to cover the normal smell.