Are there any catches? Yes, one big catch. Is that you will always generate the PoS interest but the market price of the coin is of course the be-all-end-all. So even though personally I bought X amount of coins a year and half ago and now how roughly double the coins, but as I bought in around 0.00012 a coin and it is now 0.00005 a coin, so haven't come out too far ahead.
It sounds like the price has gone down faster than your number of coins has gone up.
You have doubled your number of coins, but each is worth less than half what you paid for them. That's a loss of value, not a gain: every 12 BTC you bought in with you give you 10 BTC if you sold now. That's a 16.67% loss.
Is there any reason to expect the market cap of this coin to increase? Are there new services accepting it? An increase in awareness of it? If not, as staking causes the money supply to increase we can expect the per-unit price to decrease to keep the market cap the same.
The price went through a pretty wild raise and fall, like many coins do. That's why I mentioned it, to warn people.
As for your calculations showing a 16.67%, I'm pretty sure you are wrong on that. You are not factoring in the compounding nature of the interest. Doing some simple calculations here:
10,000 coins x bought at price of 0.00012 = 1.2 BTc
With 6% monthly interest, that grows as your coin supply goes:
After 16 months you would have 25,403 coins, and at a market price of 0 x 0.00005, that's = 1.27 BTC
Also, one of big points that I'm trying to make is that its a good time to buy HBN. I really, really don't think it will fall 50% in value, as happened im my case. As said, the coin price hasn't fallen much below 0.00003 in over a year. If you bought at 0.00004 I don't expect it to fall to 0.00002. And if you are talking short term, in one month, I find it extremely unlikely that it would fall 50%.
Nothing is guaranteed. But I'm saying that getting a 6% on HBN, at least for the sake of argument lets say for 30 days, is vastly, vastly way better of an option of investment than some of the investments others are bringing up in this thread, especially the 'black box' type where large portion will be scams. And likewise, I think that these very strong odds of making 6% in 30 days are also vastly better than making 4% of 'standard / real world' investment bond, especially considering 4% hardly gets you anywhere when the American dollar will probably have about 2% or more annual inflation anyways.
Is HBN the greatest investment of all time ? No, but I think it is better bet than most.