Throwing a lot of money at one single approach doesn't validate that approach or make it magically successful. It gives one group of people the ability to try out more than just one idea (unlike typical grants that let you maybe work on 0.5-1.5 ideas at best). Sure, their second idea will be better than their first, but is their fourth idea still going to be better than their third?

Historically, throwing some money at a lot of approaches & different groups of people tends to yield better results in the long run (see cancer & AIDS research that have received a lot of funding in recent decades).