What is more reasonable than market value? In fact, isn’t it the definition of a price based on factual empirical data?
Question was- what do people think a reasonable offer is.
If you want to stick to the facts then this is the definition. If you want to gauge at what point someone gets their feelers hurt then there are as many answers as there are readers here and never mind the seller may be offending the buyers by asking waaaay to much.