Aye, Kickstater is not of itself 'stupid'. It does take a certain amount of responsibility to engage with. Sadly, a fair few seem to not understand the role of an investor, and the risks it takes.
Back to the OP -- for the folks aok with it. Other than securing sales, what reason is their to offer pre-order bonuses? It is a known, tried and tested, marketing strategy with a body of study surrounding its practice. It's not a mystery, we know how its intended to work and why it can work, namely manufacturing scarcity, sunken cost and fear of loss.
I totally get that any company wants to secure sales - and there are many ways to do so. Some, however, are little more manipulative - and scummy - than others. This is one of them.
And of course, it's not the end of the world - but it can be the start of a trend, though arguably, we've already seen it with, 'limited edition' and 'collectors edition' strategies. I'm not a fan of those either, obviously
I'm a firm believer that, while a company is welcome to try every trick in the book to pump that bottom line, treating customers with a little more respect can go a long way. Be nice with your manipulation, and yes, manipulation can be a good thing. Make your customers feel special, valued - understood. Don't resort to cheap marketing tricks. Granted, the former requires a little more effort, which can bite into those bottom lines, at least in the short term. But in the long term, you are rewarded with genuine, lasting loyalty - which translates to a vigorous sales. This is business practice that is actually good for the hobby.
What you don't want to do is adopt a sales strategy that already has a poor reputation through the games industry. That's just a great way to alienate a fair few folks, and for what?