What if he increased the amount of produced Magic Girls by a certain number as well as lowering the price point overall and refunded the original 20 the difference and gave them something else only they could get for backing him from the start ? It would still be rare as heck at anything around 50-100 total and all could be in for less. There are over 190 of those and you never see them and their rarity as blown their value up.

I know it seems counterproductive to cut the cost of the product when money is maybe keeping the company from being lucrative, but increasing the amount made will well more than cover that and help move forward, while at the same time maybe soften the blow to the original investors...?