The beta is not a demo, and in fact we warn anyone who asks "should I preorder?" to that effect. If you're not certain about getting the game, wait for the actual free demo after release. We can't guarantee personal tastes--it's your job to decide if you truly want something before you buy it.
I found no confusion in this point. This is how games work. You bought it, so you bought it. Stardock is uber nice to offer any refund and I think it speaks to their committment to the customer and their desire for that image to be maintained. That said, hope everything works out well for you, Hityoface.