And some have thrown them out

Does the highlighted "and some have thrown them out" mean "and some of the buyers have thrown away the pieces that they have bought"? Does it mean that they have thrown them in the bin?

Context:

Disposables, shown in the Fisbach Gallery, New York, comprised coloured, mass-produced, vacuum-formed, two-dimensional shapes such as squares, diamonds, circles or, in some cases, three-dimensional objects which looked as if they had been formed around cylinders or boxes. Levine’s point was that, in many cases, it is only market mechanisms that restrict the supply of artworks and that the inaccessibility of the artwork is not so much to do with scarcity as with economic strategies. As Levine himself commented:
Thousands [of the disposables] have sold and some have thrown them out. They’ve probably been sold to only ten or twelve people who could be considered collectors; this means that many people who have never owned a work of art have gotten involved in the activity of collecting. You see it’s like Keynesian economics: it’s not what you produce that’s so important, but turnover and circulation. Economically art movements work the same way.