I don't buy publishers ....
I buy products.
True but it depends on the publisher if a product will get support, patches and additional content. If you play a FPS offline it doesnt matter much if there are not too many bugs in the release version. For an online RTS long term support is very important (Starcraft is still getting patches and look how that turned out).
As for OP's question: Yes, I will buy Stardock products in the future - if I find them interesting. Their new game looks like it might be something for me. I wont preorder again though, the last 2 month were a little too exciting for my taste... 