Aren't the OF sales weird? It seems the creator only keeps like 10% of sales amount.
It is a little confusing, sorry about that! OF takes a 30% cut, then you take 25% of the rest, which works out to around 18%. You keep the full 70% if you're modelling yourself.
I've made a couple of tweaks in version 6.3 to make OF a little less punishing with sales numbers, so you should see a bit more income from it now.