1. Expediency:  Most auctions will only be a 60-90 day process.  That quick clearance includes time from listing to closing.  Sellers wil not have to spend long term carrying costs for their property while waiting for someone to make an offer.

2.  Sellers: Your seller will have multiple buyers/offers on hand at the same time!

3.  Acceleration:  Your seller will not have to wait on the potential buyer to procure a loan or appraisal.  Buyers know "at auction" that their bids are not contingent upon financing, so they are prepared and pre-qualified.

4.  Fair market value:  Auctions are recognized as the most efficient method to establish the fair market value in a capitalist economy today.

5. Marketing:  Auctions can aggressively market to a specific target audience, that increases interest and is not endless, but for a specific time period.

6.  Under pricing:  Auctions are the best way to avoid under pricing.  The price is always negotiated upwards, not down.

7. Condition:  Properties are sold "as-is".

8.  Mediation:  Auctions are the best way to mediate a sale with multiple sellers.

9.  Seller perks:
     Seller can witness the sale of his property, either in
person or by online viewing.
     Seller can pick the sale date and closing date.
     Seller is not subject to multiple "showings" if subject property is their home.  Generally, one open house is held for potential buyers to view the property.
     Seller has the assurance that their property will be sold!
     Seller is not involved in a long negotiation process.

10.  Competition: Auctions force competition between buyers providing the impetus to get them "off the fence".  An auction price may exceed the price of a negotiated sale.