I can sell you a 10 yr or 30 yr bond, and then you sell it to someone else, and they sell it to someone else, and then they sell it back to you. Then you sell you it to me and i'll sell it to you and then you sell it to someone else. ARE YOU INTERESTED? OR DOES THIS SOUND LIKE BULL $'S. HA, HA. YOU GO GREEKS.
Sounds like that famous line from Wimpy - "I'll gladly pay you Tuesday for a hamburger today".
Or, "Beware of Greeks bearing gifts"
They want your money today in exchange for their promises that you will get it back many more tomorrows into the future. What is interesting is that the US Treasury is looking at 50 year bonds. Kind of the same thing, but with rates heading the opposite direction.