Well, can't argue with that. Unless they add grade 10 exotic crafting mats to the vendor.
The Heroic missions really aren't that hard, except for Cha Raaba Assault/Thanium Disruption. There's one very important tip that the game won't tell you: not only can you steer with the mouse, but you can steer with the ASWD keys too. At the same time. Try it. You can fly in circles with the ASWD keys to dodge incoming fire while still tracking your targets with your mouse. I also find that it works better to hold the right mouse button and drag across an area to fire missiles rather than just clicking on a target.
Anyway, give it a shot. I guarantee the missions will become easier.