Right. Most attempts to select winners end up filtering out the high-risk candidates that also represent the highest potential impact should they succeed (which also makes applicants fudge their proposals to seem lower risk high reward). So, you need to consciously allow the selection of some candidates randomly from a pool that only filters out the obviously deranged or fraudulent (in other words, quality of proposal counts, perceived odds of success does not).

There are a number of research funding agencies that are starting to use just this sort of grant funding lottery, the OP seems to be groping toward something similar.