I voted yes, although such things are just eyecandy but as Frogboy (IIRC) said, artwork is expensive. Give me some new animations for the planetary invasion (no change to the game mechanics, just artwork again), a new face for the ugly terran leader and improve the battleviewer (fleet battles) and I'll pay you 20$ or more. However just a few hulls/ship pieces for 8.95$ would also be fine.
One question here, as I'm from Europe and credit cards aren't that usual here, is there a possibility to pay via PayPal or something, because I think those "little" expansions won't make it into the stores, right?