It is well known that any property will sell at the right price. The sad fact is that in any given market there are 80% of the listings that are not marketed correctly, over-priced, and not prepared for sale.
A sharp Realtor will try to work only with clients that need to sell. That means that if they know that over-priced homes will not sell, when they figure out that your home will not sell, they need to invest their limited time working with a seller that has a home that will sell.
How much you owe, how much you paid, how much you need to net, do not matter to buyers. You might want to look at the stats for your area (see link). If the market is headed down, you do not want to be an agent with an overpriced listing.
If the sale of your home is requiring a price that will cause you to owe at the closing table, then maybe you shouldn't be selling.