It means the expensive product/service gets your attention, coz it can afford a higher bid, instead of the one that's better for you. It also sets a high floor on prices.
To some extent the bidding process was needed when there was inherent scarcity of inventory to place information (e.g. billboards or the 1 local radio station), but there's no scarcity online. Why can't we just have a web where product/service info is listed, and people can seek that info through some search engine?