Well, that's actually not enough or that is not how ecommerce works.
You see, whether its with iOffer or Bonanzle you do have to use Froogle/Google Base to get results extra fast.
But you have to pick the right keywords also, and Froogle isn't the only thing you should use.
Once you get into selling on a place like iOffer, you should get an account at the official shopping directories like 'SHOPZILLA' and the like, there are alot out there to choose from. Get an account with the ones which are the least expensive or free, then upload what is called your 'SHOPPING FEED' to the stated directory.
For instance on each site there will be a place where you login as 'merchant'. You to that login screen, and THEN login, then if you bid on some keywords, do that & add your shopping feed. The shopping feed is a document/template file- has every single product you are selling in alphabetical order according to price & quanity. Has description, product ID, number being sold, and where they ship from/shipping service.
Of course this is much better just in direct sales, or straight across selling which is identical to Yahoo shopping, Big Ticket Depot, Amazon or Clickbank & BluJay.com
For auctions, it isn't really as much of a help anyway. Auctions follow an entirely different format though this certainly still helps.
But what I notice, is with direct sales its much easier. And direct sales is real ecommerce ie: instant commerce by credit card; whether that be People Search, Affiliate Product, Big Ticket Depot or anything else which is at a fixed price and is not meant to be nor supposed to be auction.
That is where your keywords bring in the results.