Guys, I am confused 

Antminer S9 14 TH/s batch is already sold out...like in 1 day.

What I don't get is why the demand is so high 

Look:

1) BTC is currently trading $8500
2) Antminer S9 14 TH/s price with APW3++ is $1864. With delivery costs and taxes that's about $2000
3) Antminer S9 currently produces about 0.001 BTC per day. That's 0,03 BTC per month. Taking into account difficulty growth Antminer S9 will produce during its life 0,03 BTC * (1 + Monthly difficulty growth) / Monthly difficulty growth (since its infinitely decreasing geometric progression)
4) Average monthly difficulty growth
- in 2017 was 17%
- in 1Q 2018 is 23%
5) So with let's say 18% monthly difficulty growth Antminer S9 will produce 0,03 BTC * (1 + 18%) / 18% = 0,197 BTC during its life
6) But now for the cost of equipment ($2000) you can buy $2000 / $8500 = 0,235 BTC

So you can get 0,235 BTC now or buy ASIC and get 0,197 BTC in like 2-3 years.

Whats the point? Why are people buying Mining equipment now?

Maybe I am wrong somewhere?

I don't account for transactions conformation fee. Is it large? How much in fees you get for one Antminer S9?