Are you getting ridiculous offers from new members

agree with Mr. Golf. Lowball is in the eye of the beholder. Some list items way over what the market is just to see it they can grab a sucker. I offer what it is worth to me. If the seller gets angry about my offer that is their problem. If I get what I consider a lowball offer I politely decline. Some of those turned into sales close to my asking price. Telling a low baller to go shove it accomplishes nothing.

My Opinion - A lowball offer is offering substantial below market selling price for the item being sold.  A lowball offer is not based on what a seller would like to sell an item for.   There are some items that only sell used for 15 or 20% of the MSRP even though a seller would like 50% or more of MSRP.    A 20% offer would not be a lowball offer.  Bottom line - A lowball offer assumes a reasonable seller and an unreasonable buyer.

I don’t mind low offers. But some come with scolding lectures on why I should sell at that price. 

I’ve also noticed many items being sold for significantly below asking price. 

I must be unique.  I once posted an ad for some very good speaker cables with a sentence at the end that read something like this:

Approximate quote: "Note to lowballers: GO FOR IT! This is Audiogon and part of the fun is getting stuff cheap!"

I wound up accepting a lowball offer with free shipping and basically ended up giving the item away.  But at least I made a fellow hobbyist happy.  After getting the cables he sent  me a message asking if I had any MORE.  I didn't.  The point is that I see Audiogon primarily as a place to share a fun hobby with internet friends.  I accept the fact that financial gain is way less likely than losing money--for me at least.  But that's OK, up to a point anyway.