bitcoin is money. when investing money, i have 2 suggestions;
1. if it is a small amount of money, invest in yourself. buy a book and learn how to code, then code for more bitcoin.
2. if it is a large sum of money, you can invest it, but be sure to diversify your investments to minimize risk of loss;
A. stocks
B. gold
C. bonds
D. cash
E. land
This is classical investing advice, before invention of bitcoins. If I were to categorize bitcoin, I'd put bitcoin in "B", gold because most people who own bitcoins just hoard it just like people who own gold. Bitcoin is gold on steroids. It is deflationary, like gold, too.
I have some coins idling around in my wallet but I cannot bear to put it in hyip or risk it. But it is a waste to let it idle around. Yes. I have coins in some "lower risk" hyips to generate some interest which I'm prepared to write off. I also have some coins converted to hashing power in hashnest and BW.com but it has to be monitored else you will suffer a loss instead.
Unlike fiat currencies, I cannot park these coins into banks backed by governmental institutions. I put my fiat currencies in banks or blue chips but I cannot do it with cryptos.
So, what do you do with your idle coins? Let it sit around?