Does it make sense to "ignore low ball offers"?

In any sale there is a zone of probable acceptance (ZOPA) outside of which nothing will happen. Not responding to a low ball offer outside of ZOPA actually signals ‘No, I am not desperate and there is no point discussing.And someone lowballing an offer has no god ordained right to an answer

If the offer is so low as to be ridiculous, then I ignore it. Sometimes I encounter an offer that is say 30% of what I'm asking. When that happens, I ignore it.

@roxy54 - Yeah, I agree if the offer is 30% of the asking price thats ridiculous but I would still make at least one counteroffer to see if I can get the item sold. 

@antigrunge2  - there is no "god ordained right" to much anything in this world. haha  I'm just trying to find out why people won't negotiate or at least make it clear in the ad by saying "price is firm"  

It is a matter of personal style and preference.  I almost always respond, either stating my current price expectation or to simply say  “no.”  However, I certainly understand why others choose not to respond to low offers.  No right/wrong approach, just personal style and preference.

@mitch2 - You say: "I certainly understand why others choose not to respond to low offers." Why do think it is they don't respond?  The negotiation has to start somewhere.  If the potential buyer continues to make stupid low offers then its time to cut it off but to simply not respond doesn't make sense to me.