Does a pre auction offer give you a better chance of securing the property. Well not entirely. Contrary to popular belief having a pre auction offer does not mean you have bought a home. In most cases it means that you have bought the auction date forward.
In a sellers market where there are more buyers than sellers, in general most agents will go about a pre action in a particular way.
If your pre auction offer is accepted, a mini auction is run 3 days later. All other interested parties are generally informed of the new auction date.
The starting bid at the new auction will be your offer.