Sustainability-wise, parts need to have a significant mark-up. Otherwise: 1. People will either themselves bodge devices together, or get someone else to do s

Sustainability-wise, parts need to have a significant mark-up. Otherwise: 1. People will either themselves bodge devices together, or get someone else to do so. 2. Companies will find it hard to sell new products if they can all be fixed easily. If the parts have a mark-up, they can be a good revenue stream. Unfortunately, companies are greedy and still make stuff hard/impossible to repair while charging high mark-ups for what can be.