I am sorry, that you do not feel jetBlue was honest.
Having said that though, all airlines operate on different fares, 14 days, 7 days, etc, you know the drill. In addition to that, depending on what time of year it is, there is fluctuation in prices. If you were willing to travel on say wednesday, it would probably be cheaper than friday afternoon.
AA runs a great commercial, how a pax flew for $129, and that is certainly feasible, but that is not the everyday everywhere every time fare.
While I wish you could get the $79 every day, obviously, that is not economically feasible. jetBlue does however cap the top fare at $299, not sure if many other airlines do this, I think SWA and AWA does.
I hope you will come back and fly with us again.