Are you getting ridiculous offers from new members

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.

"  After getting the cables he sent me a message asking if I had any MORE"

Yea, he might be flipping it on eBay or another site, not surprised he asked for more.