Can an accepted offer be a lowball offer too?

A friend recently bought an integrated amp- spent quite a bit if coin. It was advertised as like  new. He and I were quite surprised at what that seller considered like new. Amp went back, refund issued 

Why would I return an item if the SELLER has regrets?

Because evidently you have regrets too, as the buyer.

I made an offer on something, paid promptly, and received the item which as not in the excellent condition as advertised. I mentioned that and then the "lowball" word came out.

It seems that the seller was not happy with the price, and the buyer was not happy with the stated condition.

Were you trying to renegotiate the sale price after the fact due to your regrets about the condition?

Something different but not too far from the subject. I once bought a piece here, paid for it, received it quickly, condition was as stated, everything worked. Then in a few days I got a message asking me to sell it back to him for the same price. I politely refused. Later in about a month I got another message with the same request. Both messages were short and polite, no explanation was given. This time I decided not to reply. No more messages. He did sound to me like he very much regreted selling it but for whatever reason had to. For some time I felt like sh-t a little bit about this story but then got over it. Still, there is a residue.

"Were you trying to renegotiate the sale price after the fact due to your regrets about the condition?"

In a word, NO

The condition issue was regarding a wooden cabinet, which I was able to correct myself using steel wool and some refinishing products.

If you take a low ball offer its your own fault.I get many jerks that offers less than half of my asking price are they joking??