elements arranged as columns, with the main content in the central one. When a user, who's only really interested in the contents of the main, central column scrolls down the page the content of the left and right columns usually finishes first.

In Renderosity Marketplace's case it's made worse by the fact that the top part of the central column is the 'Sponsored Items', which are unrelated to the category/criteria that the user has specifified, and they HAVE TO scroll down to get to the strat of the stuff they were actually looking for!

This is a very, very bad design flaw and happens with a huge variety of websites.

(N.B. I didn't actually check the page source so my comments may not be quite correct, but you can see the problem)

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).