1. If you hire 10 or 100 computers for the same task, the latter option will indeed run ~10 times faster, yet you will pay exactly the same thanks to the stationarity of the pricing algo.
Assuming that the providers are evenly priced and reliable, of course.
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.
3. Hoarding coins by the providers is bounded, unlike other coins. Bitcoin has no apparent 'upper limit'. But Zencoin cannot worth 'too much': roughly saying, it cannot make the home pc cost more than aws, since the competition will balance such a situation. (leaving aside that zennet being more expensive than aws is hypothetically possible, if zennet gives more speed etc. and actually worths more).
I'm not sure that it really bounds in this way, because both spot price of the coin itself and provider rates can change. If hoarders drive the price of the coin up the pricing of the resources will simply go down correspondingly, no? I'm actually very interested to see how this dynamic plays out in the end. There are a few different potentialities and I'm not sure if there is a meaningful parallel that could be studied first.
4. Zencoin less depends on variables exogenic to the computation market, since it should not be used for other cases like buying coffee or car.
People likely will anyway. I suspect that speculative traders will be the largest externally influencing factor. This is just a hunch.
5. The growth of the amount of hardware is maybe the world's most craziest thing over the last decades.
No, the craziest thing is probably the amount of wasted energy this mass of hardware has burned through while sitting idle!

6. Zennet presents a novel pricing formula, which can be used to price other assets as well, even when the underlying components of value are totally unknown.
http://zennet.sc/zennetpricing.pdfIs the intent still to have this pricing model be just a "helpful tool" and not a mandate? I still think this would be very important, and being able to script alternative pricing models would be very nice to have in addition.