It would be interesting if the interest was higher. As tokyoghetto stated it in his
HBN investment journal, "20% is not enough when the price can drop 50% overnight".
Too bad because the growing PoS idea is interesting.
5% per month would be much more interesting. 60% at the end of the first year is on par with Philosopher's Stone (less rewarding, since you would break even with PHS only at 10th month, but starting from year 2 it would be interesting).
+5% every month for first year => 60%
+2.5% every month for second year => 90 %
+1.25% every month for third year. => 105%. Considering TEK is at 480% an year (6300% with compounding) and performs very well (too well, I'd say), it may not be too much. PHS is at +50% but not NVCS like TEK/HBN and NVC, which means the interest is constant and doesn't depend on do not decrease with the network difficulty.
Ending it brutally, though, would kill the coin so something would have to be considered.
I feel like starting from April, high-stake coin got less interesting to buy because people started to take notice of this coin. Maybe MINT is the one that raised awareness of PoS to a greater audience.
Now, will new get-rich-quick schemes will divert money from high-PoS (=> price drop, you can buy) or will we have to resort to newly-created high-PoS coin? Unfortunately, all of them (LGD, GWT) seem to be premined :/
Heres some additional info how Digit PoS is built.
It starts from 0.2% first month. Then 0.4% 2nd, 0.5% 3rd and continues until it reaches 7.2% in month 36.
Adding this together and here is what we get:
1st year = 15.6% (Average monthy interest in year 1 is 1.3%)
2nd year = 44.4% (Average monthy interest in year 2 is 3.7%)
3rd year = 73,2% (Average monthy interest in year 3 is 6.1%)
From here, interest rate will start dropping.
4th year = 70.8% (Average monthy interest in year 4 is 5.9%)
5th year = 42% (Average monthy interest in year 5 is 3.5%)
6th year = 13.4% (Average monthy interest in year 6 is 1.12%)
7th and all years after that = 2.4% (Average monthy interest in year 7 is 0.2%)
Since their PoW is difficulty dependant, it will should sort itsself out just beautifully. If mining profitability goes down due high supply, then block reward will go down and new supply will decrease.
Vice versa if the opposite situation occurs.