Imagine getting the opportunity to sell microsoft office to the entire world again how much money is on the table. It doesn't even matter if it works. If you can get the mindless corporate buyers to purchase it along with all the other useless redundant junk they also purchase you are making money hand over fist.

Fusion power on the other hand has to work as it doesn't make money until it does. You can't sell futures to people on a fusion technology today that you haven't yet built.