Absurd layouts

As the old saying goes, you get what you pay for.

Are you talking about 3D print models category right? There's a simple solution. Buy only models which show the real print.

Have you contacted the artist? Sometimes a design will be exported in the orientation it is displayed and not the orientation it is printed at. Its up to the person printing to determine the optimal position the model is to be printed to avoid excessive support structures and wasted material, but as to not impeded the look or functionality of the model.
Also, for example, if you're printing a spinning top upright, there will be little base touching the build plate and a support structure will needed. You could turn the top 90 degrees, but that might throw off the balance because of deformity.
While I'm sure the owners of this website, in addition to the members, want to keep everything on this site, high quality, unlike some models on free sites where a few primitives are stuck together in a vague interpretation of the likeness of a real object, some responsibility goes to the customer to print it correctly.

If you have a link to the model, it might go further in determining if this is a printing issue or a design issue.

Agree with IndieArt. If you look at the category of models (free) supposedly intended for printing, you'll see that half of them must be mis-labeled. There's no way a lot of these could possibly intended for printing. Don't know if this occurs because some default setting causes these to be included in the "printables" catagories, or what.... But, most professionals making a model for printing do provide an image of the printed version. These are the only ones I'd consider expending time and effort on.

Hi there,
Are you talking about 3D print models category right? There's a simple solution. Buy only models which show the real print.
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Sorry my bad english. But I'll try to explain something:

The ONLY criteria for printable models is CORRECT geometry of the model: closed solid mesh without intersecting and overlapping triangles that complains with the printer (or technology) specifications (minimal wall thickness and good printable details of the surface). Placing (orienting) models on the printers table is the job not for modeler but for people who PRINTS those models on their own 3d-printer.
Placing supports is also customers task. The modeler/designer can't know what printing or CNC equipment and techniques will be used by customers: e.g. CNC mill, Solidscape printers, SLA, MSLA etc... So doing USELESS job like preliminary model positioning can take too much time and give lots of unneeded results that will never be used by customer in the real life.

Also exists option to contact seller/modeler/designer and discuss with him/her all questions you have. I think most of fair cgtrader-people is open enough for communication with customers/buyers.

If you can't to rotate/translate the model and place supports like you want and need or if you don't see or don't "feel" the models "printability", just don't print anything. Or make model yourself to get PROPER (in your vision and opinion) model.