Fine if they want to keep them so hard they should give much better loot. Everyone should be able to agree that the difficulty to loot ratio is just wrong. Fix one or the other on these things.
They should also make the higher level ones much harder so that they all match up. Then they should make the flashpoints harder still.
Call it whatever you want the difficulties should all match up properly instead of being shoddy and all over the place. If you go into a heroic you should know what kind of difficulty you're going to face.
They give nice exp, cash, and blues (and in some cases purples) on completion, what more do you want?
Thats more bang for the buck than a flashpoint, where you might, or might not get a blue at the end.