... for whom ... the buyer or the seller?

Reminds me of a conversation I overheard at a local flea market awhile back:

Buyer; "How much for this item?"
Seller; "$10"
Buyer; "Can you do any better?"
Seller; "Sure ... how's $15?"
Buyer; "How is $15 any better than $10?"
Seller: "It's better for me!"