Does Site Structure impact on Sales??

[anush]

I have a query regarding conversion. Recently I came across a site which sales music/audio equipments. On the homepage it is like any search engine where you have to type for your product then it will lead to a page where you will get the list of sub-categories of the product. On that page you will have to click on that and it will lead you to the available brands which are providing that item.

That site does not have any direct link from the homepage or landing page to the product page or brand page. I was just wondering that the navigation and overall structure of the site is pretty complex, so aren't these factors effecting the sales of the site??