About FOOBOT (guys, feel free to delete this post if you think it violates the guidelines!)
Just read a comparison against another overpriced product Awair:
It is quite overpriced, and after spending 2 yeards trying to biuld and promote my device i can tell you exactly where the money goes
For Dust measurement they use one and the same crap optical sensor made by sharp. It costs less than 5 eur, and the output that it gives is quite relative
All in all i would bet the electronics in their box cost < 20 eur. Awair has added some basic auto-adjusting NDIR CO2 Sensor (at best), which makes the BOM ~ 40 eur.
Usually prices of stuff are twice less if you order 1000s, compared to 50s (like i do 
), so maybe i cannot even estimate the low border
All the other money that you pay to them goes for:
- IFTTT registration - 3000+ eur / year
- Injection molding tools - 10000 eur
- Mobile app - 20000 + eur
- Nice enclosure - 10-20 eur per device
- Amazon fee (10%) - 20 eur (if you sell on amazon, you cannot sell cheaper on your shop)
- Packaging - 5 eur +
6.-10. Marketing - Decent video is 3000 eur +, site design, reviews is also not cheap
So if you are going to buy one of those devices and are not going to use IFTTT, the mobile app, their coud, would throw the packing away, and do not care that much of the looks - that leaves you with a 30-40eur worth a device.
There is a big market for those as they are quite consumer oriented and to get to them, you need to pay this money and advertise. But people in the HomeAutomation communities are rather pro-sumers, and have their own idea how to integrate with the device