What to do with very low offer on an item for sale

This gets back to the adage "what is anything worth...what others are willing to pay".

One time I had an item for sale on Audiogon and the "buyer" used their "in mail" to send his cell number, saying he had too many questions to send "in mails", we went back and forth and agreed on a price and he made the 90 minute drive to buy the item, but when he arrived in my driveway said that he thought about it and was only willing to offer me $600 less than we discussed.  Of course I sent him packing.  What I learned from this is that if someone is interested in making an offer, have them do so "officially" using the Audiogon site.  In my mind there's no big deal to refuse any offer, just that it's best that it be posted on the site.

@ejr1953 +1 ""what is anything worth...what others are willing to pay”"

@ejr1953 

Your guy was a pretty dumb low-baller... He drove 3 hours round trip, spent $30 or $40 on gas, and came back empty-handed.

@devinplombier Agreed!  I let him know that.  Though I told him he wasted his time, "Einstein" asked if he could see the unit before he left.

I respond to all offers, and if the offer is too low, I simply decline the offer. 

I try to get a sense of the ballpark for an item by recent sales.  I don't mind giving someone a great deal as once I decide to sell, I am a motivated seller, but I will and do hold out for a fair price, I don't think I have ever had anything for sale for more than a few weeks before it sold satisfactorily.  

I also think it's so much easier to sell now than it was decades past. I am in the US and have sold a number of items outside of the US.