Just wondering how many units of each miner might exist in the world.
Looking at the Antminer S1, did Bitcoin really sell that many units of that miner? It was their first miner and they probably produced a small amount before the new BM1841 chip came out (Antminer S3)
It seems that the S2,S3,S4,S5 sold in large numbers.
The SP equipment unless its the Sp20, also sold in small numbers.
The Avalon you rarely hear of that equipment.
My estimation are
Antminer S1 - 10,000 Units
Antminer S2 - 25,000 Units
Antminer S3 - 50,000 Units
Antminer S4 - 10,000 Units
Antminer S5 - 50,000 Units
SP10 - 500 Units
Sp20 - 2000 Units
SP30/35 - 250
AVALON 4.1 - 2500 Units
Dragon 1TH Miners - 10,000 Units
KNC Saturn/Jupiters - 10,000 Units
KNC Neptune 10,000 Units
There are more SP 35 units for sure.