Is there a rationale behind Ebay Express' decision on how to display the categories filter on a results page?

"Mario E. Santoyo S." <[email protected]>
Newsgroups gmane.comp.web.chi-web
Message-ID <[email protected]>
Good afternoon to you all,

Does anyone knows, or can point to a paper, why does Ebay Express decided to
reposition, within the results page, their categories filter? Instead of
using the commonly known solution of having it placed on the left side of
the results page?

My guess, and the rational behind why we are inclined to use this approach:

It was done to enhance the resulting products visibility and reduce
cognitive overload; with this new position they earn some lost page space,
and while the user is scrolling their full attention is aimed at the
products and not derived to other links/venues (ads, site's other features,
etc).

Please keep in mind I am leaving out on purpose the fact that the chance on
lading on such a result page on Ebay Express' is minimized to their
"Category decision" page which appear each time the results for a given
search are part of more than X categories (
http://search.express.ebay.com/__?_nkw=dvd&_from=R40&_nd1=0); therefor, this
position decision shouldn't be a major complain for them since the vast
majority of their users won't need to choose a category within the results
page.

Ebay Express' new way:

http://search.express.ebay.com/items/dvd_W0QQ_nkwZdvdQQruZ

Amazon's old way:
http://www.amazon.com/s/ref=nb_ss_gw/104-5406100-5156745?url=search-alias%3Daps&field-keywords=dvd&Go.x=0&Go.y=0&Go=Go

Best regards, and thank you for any pointers,

Mario E. Santoyo S.

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