Sweet, I just need a small, interest-free loan of 3 million dollars and I'll pay you back $10,000 a month for 300 months. Don't believe me? Here, check out my credit report.
This is a person who doesn't understand how the fixed income market works.
He's assuming he's buying $3m notional of a bond yielding 8% and paying for the face value $3m (i.e., he's buying it at par). This is not how it works, even if you're somehow subscribing at issuance as a retail investor.
You're going to be buying the bond at bid, which is going to be higher than par when prevailing future yield expectations are lower than the coupon rate of the bond.
TL,DR: You can't buy $3m of a high-yielding sovereign bond for $3m today. You'll get less of the bond for the money if it's yielding more than the market is expecting base rates to be in the future.
The opposite end of “The most expensive thing is to be poor”.
It’s a common image for so many millionaires to have a Scrooge McDuck vault, but that’s the thing; so often their millions are out earning them further millions.