I think it's more than just profit. For me, because I have so many discs (literally a few hundred burned CDs plus a number of DVDs), being able to store them compactly is very important. And for companies that make and sell them, compact storage is important, too. Plus, if they can cut costs, the prices for consumers will fall, and they'll be able to sell more. Yes, more profit for them, but it's good for us, too, because it means that we get to buy more. Overall, I think that cartridges are a bit clumsy, and if they can find a way to protect the disc without a cartridge, I'd welcome it.