Even if there is no reserve price, you can set a starting bid minimum.
The auction doesn't have to start automatically at zero or one cent.
Let's say that you as a seller wanted at least a buying price of around $500.
You could set the opening bid at $425.00.
Hoping that a bidding war might begin and that you might get at least your asking price or a bit better.
Depending on the supply and demand value and availability of the item which you are offering for sale.
In fact as another poster once mentioned in the past, that his starting bid price as a seller for a specific item, actually was his item's reserve price.