I experimented with smOS very early - I remember that time when many other members including me giving daily feedback on ETH mining - cleary Claymore was our favorite. Then we had the ZEC crazy days, back then with no good Linux miner in sight we eventually got zcashgpuclient/coinsforall.io and zogminer (anybody using them still?) - crazy days testing that I must have burnt so many GPU hash just to test them on smOS. At that time, I was seriously testing ethOS, smOS, PIMP and my own Ubuntu build. Then when better Linux ZEC miners came out like SilentArmy and Optiminer - then finally Claymore released Linux version - I made a few smOS thumbdrives for live rigs.  Again time to time, members including me will ask Tytanick to add specific miners (ie. wolf, boolberry, pascal miners, even my recent request for zawawa-gateless gate -- btw,  when is ETA?)

Why am I saying the above?

FACT: smOS was built to this stage with strong and active mining community support.
FACT: Developer need constant feedback and useful / in demand features

Same as SRR project, the idea and project is good -- without community support and demand -- it will probably wont be successful because you need confirmed demand from buyers to determine capacity. For example if only 10 people is confirmed want the SRR, would it be worth it to mass produce and develop SRR?

In the context of smOS, you had this idea since 2014. It was kind off re-introduced in mid-2016. I remember testing smOS and sharing it with many other members to try it out (that includes legendary members like philipma). At that point, given the frenzy in ETH, ZEC and XMR coins the need for something simple like smOS is very good idea. This I think, was the main attraction to smOS.

So my suggestions are the following:

METHOD:
Tiered flat rate one-time-fee for most users. A one time cost, including free upgrades to the latest software version.
 You can charge a different package for large farms.

Example:
a. 1-2 clients FREE TO TRY
b. 10 clients USD$50
c. 20 clients USD$100
d. 50 clients USD$200
e. 100 clients USD$400
f. 101 and above - Custom packaging.


Your development of smOS will probably also need to capture NVIDIA miners in future - if you want to charge by rigs or gpus monthly - it will be expensive for many, complicated to enforce and will introduce more questions. I believe if you do a flat rate fee you will get more customers and almost guaranteed to be the leading mining OS in the crypto mining world.

Just my honest feedback, comments and feedback welcomed - because our goal for smOS and to support Tytanick is for miners to adopt his OS and invest in his OS, easily and conveniently. A win-win for all parties.