At this very moment, complex (eg. keyboard, complex camera systems) Jolla Other Halves aren't commercially viable yet, because the market is small, except maybe a keyboard other half. I think by the end of december, around 6000 jolla devices will be around. Let's say one in six want a jolla keyboard, then the market for keyboards is 1000 by the end of december. The value of the parts of such an other half is probably arount €8, for a batch size of 1000. The prize I think you can sell them for is around €25. This means you have a profit of €18000. This isn't much to justify development of such a piece of hardware, but.. The market will grow, so it's probably just commercially viable. A better plan is to create designs for a slider other half, which we obtain in higher numbers, and create a website with jolla designs, where you can buy parts, so you can assemble them yourself. This way we don't all have to reinvent the wheel and no-one has to take the economical risk.