Agreed. That's what we found at Bitpass, a micropayment system for digital content in which people were asked to buy a prepaid "phone card" for digital content. The minimum prepay was $3 and people were still complaining.
So, based on our experience at Bitpass, we recently launched a cashless micropayment system, ThankThis.com. Instead of a Flattr button, there's a ThankThis button. Clicking it shows you a small sponsored message (i.e. an opt-in ad), which pays the publisher and gives you points for your favorite charity or nonprofit, which could also be wikipedia.
How many people were curious enough to sign up today? I think that speaks to how compelling the concept is. Of course, it also has a lot to do with the desire to name squat to protect your brand. Personally, I signed up but may never use the service. But I don't want someone else using my name as their handle.
Apple could do something like this in a heartbeat with me.com, but about.me is likely to be device- and network-agnostic, i.e. you won't need to own an Apple product.
Is Tumblr a blog? It's growing like crazy. OTH, Posterous growth as a blogging platform seems to have peaked, which may explain their pivot to Groups, which is a social networking and media sharing play, the heart of Facebook and instagr.am.