Don't get me wrong, I buy software that I really like or use for business. But to evaluate an app or play a game for an evening or two before dropping it I'll never throw 50€ out of the window, basta!
That's what demos are for. It's precisely because of people who "evaluate" software that developers will get away with things like this. If this becomes the prevailing argument against moves like this, the heavy-handed developer will win every time.