The job of an auctioneer is to increase the price of the product that is having more demand at the same time the supply of the product is limited. Auction is not held on a daily basis; it depends on the consignments they get to arrange an auction. Once they get a consignment, they will arrange for the proper areas. In addition, they will advertise for the auction to get more and more people attending the auction. That will help in increasing their profit at the same time. For publicity, they may print some catalogs in the case of a high value item you wish to sell in the auction.
The most important factor regarding the sale in the auction is time. Auction is an ideal way for selling your collection of coins. In addition, it may again include factors like time (most important), efforts you can put, and another important thing is the additional amount of money you are willing to invest.
Just as all our fingers are not equal; similarly all the auctioneers are also not equal. Some believe in dealing only in high value property. Some deal in both high and low value. Then there are some who want to deal in the best quality of the product no matter whether it is of high value or low. For example, you can find a minor value coin collection being sold by a high value auction house.
You need to understand that what you are willing to sale is acceptable by the other at more value than you are expecting. If you are thinking that you can make a better deal with a person on your own, or you will get more value from the coin you have collected if you are selling it by a dealer then choosing auction is not appropriate for you. However, if you are satisfied with the format of auction then this is the perfect market place for you.