If 75% of the profits go to the government (and arguably, as long as the monarchy continues to exist, the other 25% covers expenses that the government would end up funding anyway), then doesn't that make the Crown Estate actually a small Sovereign Wealth Fund more than anything else?

Lots of the media coverage around the Crown Estate seems to focus on the wealth of the Royal Family - if I were their PR team I'd be trying to push the (quasi-)SWF angle pretty hard.