Im seeing that Linzhi Phoenix is selling for around $15k USD and calculators have it earning around $350 USD per day, or about $130k per year.
1. If that's true, why wouldn't everyone and they're mother buy one of these? given the ROI.
2. How long do miners usually last before they bug out or need to be repaired?
3. Why is it that if the same machine (Linzhshi), mines ETT, it makes around 10K per month, but if it mines BTC, it loses money?
1. When these Linzhi Phoenix miners release the Ethereum difficulty will increase extremely fast (Probably 200%+ a month, depends on how many units are shipped out.) which will result in the profits being more in the <$50 range, not $300.
Ethereum (while unlikely) may also change algorithms/try to prevent ASICs which could render your whole investment void.
2. Depends. I don't know anyone that have these machines yet so I am unsure. Probably every few months, depending on the build quality Linzhi offers.
3. The Linzhi Machine is designed for the "Ethhash" Algorithm, not SHA-256. You can only mine Algorithms that your ASIC is designed for.
If you have any other questions, please let me know