I would arbitrarily define individual as anybody with less than 0.1PH (100TH)=~100 S5 or ~20 Sp30-35. If you have more-you are a real business.
My prediction is not more than 10-15%, but I could be wrong and would appreciate pointers to an accurate estimate.
How many SP30-35 were produced? I remember seeing $28mil revenue for Spond.
With an average price of probably ~$4000 over lifetime of sales, this would be ~7000 machines or ~30 PH. Maybe 1/3 are individuals or 10PH.
Phil was posting estimate of S5 sales somewhere, but I could not locate it.
Antpool has ~20% (~80PH), but it is not necessarily all S5. Maybe 1/3-1/2 are individuals=26-40 PH or ~20K-33K machines which looks like an overestimate, so perhaps these numbers are too high. If estimates are correct, then ~36-50 PH are individuals (9-13% of the total hash) without counting S3.
Opinions?