Some economical aspects on Zennet (will slowly make this list longer):
As your project proceeds, you will likely need more support with your English: economic == the discipline, economical == thrifty. Fortunately, mangled syntax English robust against is. Except for 2. (below) where the tense makes a crucial difference in this particular context ...
1. If you hire 10 or 100 computers for the same task, the latter option will indeed run ~10 times faster
That statement makes an implicit assumption that the task is always amenable to parallel processing. Have you examined the range and depth of that assumption in terms of how much of the anticipated business depends upon it? Is it intended that the solution space be limited to such tasks --- or at least those tasks which are amenable to a parallel solution and can be identified as such, characterised and quantified in some reliable and accurate fashion?
FWIW, you don't mean "~10". The most favourable statement that you can truthfully make is "up to 10 times" and I suspect that you'd be hard-pressed to provide solid support that ~10 is the general case and not, in fact, some difficult-to-quantify smaller subset.
2. Entities who buy a lot of Zencoins, usually do it in order to calculate something, hence spread them back to the people right away.
Can I just check (in case it's not merely a trivial issue of EFL) --- this is actually a forward-looking statement, a prediction of a future state rather than a description of an existing state? Because if it is a forward-looking statement, I'd really like to know how you got to usually.
Cheers
Graham