Press 1 million discs, sell 500k discs. Price of those 500k unsold discs is several million dollars. Pressing discs is a huge risk. Don't press enough and you l

Press 1 million discs, sell 500k discs. Price of those 500k unsold discs is several million dollars. Pressing discs is a huge risk. Don't press enough and you lose sales. Press too many and you lose money. Online has no such issues.