Borrowers paying exorbitant rates of interest are doing so because they have to do so in order to attract capital, not out of the kindness of their hearts.
From an article last year called "
Junk Bond Indigestion in the Bitcoin Economy":
"...promises of exceptionally high yields on Bitcoin-denominated debt do not represent the going rate or remotely plausible yield expectations for debt or other Bitcoin investments; they represent nothing more than the risk premium for low-quality debt."
No one ever pays even a dime from their hearts -- jokes aside, the volatility and past performance in btc/mining products have made many convinced of double digit returns. Add to this the fact that some of the alt-coins provide a significant returns fuelling the fire.
That said, tell me 5 bonds on this forum which in real world will not be rated junk? If not for the idea, the way people handle funds.