Huh, it seems I need to dismantle my own argumentation here. There is certainly value in fighting artificial scarcity, but systems like Patreon might be just about as good for doing that than QP:
https://transforum.fractalfuture.net/t/flattr-patreon-crowdfunding-and-quantified-prestige/1076
And Patreon actually exists now and is becoming hugely popular. So, what I am proposing is akin to arguing like
See? The success of Facebook means that there is lots of value in social networks. So, let’s build a better social network, even if the chance of replacing Facebook would be small, it would have a huge value.
The fact that Patreon exists and works is a good sign that a digital abundance economy might be on the way. It’s hard to say whether QP would be better than Patreon or not. QP is not the first system that has the chance to create an effective digital abundance economy. So, it might not be the best idea to use the creation of digital abundance as main selling point of QP.