I think 10% of members spending money is too high, as well as the number of 50 dollar. I think al of members that would buy spins do it only once, just to check, while only a small proportion regularly spends money on it. Of course, nobody has the correct numbers except for Jagex, but this is way too high. I don't think SoF increases income for Jagex by 50%, although I think it does add substantially.