Depends on your definition of "use".
Some of the quilts which won BIS at major quilt shows are used at museums as display pieces.
Many are shown at multiple shows and eventually used as wall hangings in the makers homes.
Others are used multiple times by the maker in trunk shows.
Quite a few are used as samples to make/sell patterns, books, and classes - either by the maker or by the fabric designer/manufacturer.
Others still are donated and used as charity fundraisers.