Ignore those messages from eBay
. They are bogus AF. I see them as both a seller and a buyer. The messages to buyers always suggest making a higher offer, and the messages to sellers always suggest pricing items lower or making lower counteroffers.
Those messages are created by eBay
for the benefit of... eBay
. Period. They do not have buyers' or sellers' best interests at heart, only their bottom line, so their algorithms will recommend ANYTHING to increase the likelihood of a sale.
Offer what you feel appropriate, regardless of what eBay