To enter into the realm of complete conspiracy theory, they might be trying to force a collectors bubble. If they've got a box of 100 copies of 1E WFRP, which easily sell for £20 each then the investment to build a track record of inflated prices makes sense. A third party will enter the fray, they'll pay up the dosh, then relist and bounce the item between them, creating a false trail of value, skewing the market. They can then sell their stock for silly money. Similar thing happened with Disney Black Diamond VHS tapes, and lets be honest RoC:LatD is neither as rare or as good as the price demanded.