I don’t see what that has to do with (increased) advertising on the App Store (IMO search there never has been good) or the comment you replied to in which colechristensen said: “I'm actually pretty disappointed in the lack of discovery available”.

I think paid advertising may even help improve discoverability on the App Store because, instead of making 10 or 20 to do list apps and hoping to get them to rank high by a combination of sheer luck and SEO tricks, scammers may only make one, and pay to get that to the top of the list.

In super markets product placement is affected by two factors: how much producers are willing to pay for a good spot (e.g. by offering lower wholesale prices if the product gets a more visible place) and vetting by the store owner.

I don’t think different solutions exist in the App Store. Apple doesn’t want to do much vetting, making advertising the only thing that may help (and yes, it would be awesome if there were a store that did do much vetting, but that requires a world where many different stores exist, and we aren’t there (yet))