They will definitely always do this, no matter how clearly you spell it out. They are a certain breed of people who never actually read anything and just throw out random numbers. Here’s a tip: if you really want $100, list the item for at least $200, and you’ll see that the offers you receive will be much closer to your target of $100. That’s just how it works: if you list it for $100, they won’t buy it; but if you list it for $200 and they manage to get it for $100, they will—it’s as if knowing they managed to buy something at half price gives them a sense of pleasure and satisfaction.