The idea works best if what you are auctioning is something high-profile and/or of high value: if you auction off a holiday in the Seychelles, this has more impact than auctioning a weekend break in a country hotel. If you have something topical to sell, so much the better: during the 2009 recession, cars were not selling at all, so auctioning a car might create a considerable impact. Your decision has to be based on how much you can afford, of course.