Are you sure that it isn't even completely computerised?   The soon-to-disappear recording company, EMI, has had a policy for a long time of pulping unsold CDs (if "pulping" is what you do with CDs), if a particular issue fails to sell a certain minimum within a set time.   The system is computerised and automatic.   Unsold items are herded into the tumbrils and shipped to the guillotine.   This hits the classical releases especially, because they always achieve dramatically lower initial sales than pop  music.   The difference is that  sales of pop music albums almost invariably fall off a cliff after a few weeks, or even days, whereas  a classical recording that stands out may continue to pick up sales figures over decades.   Only very rarely will the classical sales even remotely rival the pop music blockbusters, but, given the chance, they can far more than recoup their costs.

Manufacturing discs and then destroying them, without even trying to sell them, doesn't seem, to me, to make a huge amount of financial sense - and may be one reason why EMI is shortly to be one with Nineveh and Tyre.   Renderosity isn't suffering any similar manufacturing costs, of course, but it's hard to believe, either, that it is making any significant savings by deleting products, since storage is so cheap.   Retaining  the seemingly unwanted stuff , even if it is on a linked site, might be to the benefit of Renderosity, as well as of the users and of the vendors.

What if a vendor's first two releases bomb, for no better reason than that no-one recognises her name?   Her third release takes the market by storm and leads customers to want to see what else she has done - only to find that the Renderosity auto-da-fe has eradicated the earlier efforts.   Who benefits from that?