This project look promising. I've never seen a project like this... design is superior to Storj.
Adding to my list.
I am considering acquiring sianotes over on the NXT AE. What is your projected average-case ROI for siafund investors?
The price is still cheap even though two Sianotes were sold at 18000 NXT/sianote today at the highest price ever. But even at the 18000 NXT price it is still a very low price comparing the other similar projects like Storj and maidsafe.
For instance, right now, the Storj's price is about $0.0188/coin and Storj has 500,000,000 coins in total supply, which will bring Storj's overall cap to about $9.4 millions. If you use the Sianote's highest price 18000 NXT (which is about $216) to calculate its cap, Sianote's cap will be $216x10000=$2.16 millions. It still much lower than Storj's overall cap.
In fact, Siafund is of different nature compared to storj coins. siacoin is the equivalent of storj coins. So even though your calculations are correct, the comparison is largely irrelevant. 10,000 siafunds are entitled to receive 3.9% of all host incomes.
However I want to point out that when Siafunds (formerly sianotes) were first offered, it was around 250usd each because Nxt price was much higher by that time. I found this in the Nxt forum
https://nxtforum.org/alternate-cryptocurrencies/sia-official-nxt-thread/msg61639/#msg61639Quote from Taek: (awhile ago when it was at $250 per siafund(sianote))
Currently Sianotes are being sold for ~$250 USD each. 1250 are then worth about $312,500, meaning at current network prices, the total host income for storage (which will also be about the amount of money spent on storage) is estimated to be about $62,000,000. This is over the entire history of Sia. Sianotes are far from worthless, especially if you expect Sia to sell more than $62,000,000 of storage over its entire lifetime. We (the devs) certainly do.
So I think the current valuation of 18,000Nxt per sianote is a fair one in fiat term.