KIckstarter is not now, and never was, about micropayments or micro contributions. Not just because of fees and commissions but because, at the core of kickstarter, it's about products. The huge majority of people who support kickstarter projects pick as their reward the product being developed. This kinda makes your entire argument moot.

Now, I'm not saying Steemit isn't a viable option for crowdfunding. In fact, my last crowdfunding post was literally about how it IS a viable platform for it, despite issues that need to be sorted out.