Only in bitcoin land would a 30% yield be considered low.
At a flat 30% yield, not compounded, it will take 172 weeks to break even.
How confident are you that they will be around in 3+ years? How confident are you that they can maintain that yield?
If you bought at the current price. My shares were bought at around
BTC2.5. Some payed even less for them (and likely already made good on their original investment).