So I'm saying, if natural selection thought a unit of eye goodness is worth 1,000 bits, up to 10 units, why in modern humans doesn't it purchase 3 whole units for only 5 bits -- the same 3 units it previously purchased for 3333 bits?

Perhaps, in the current environment, those 3 units aren't worth 5 bits, even though at one point they were worth 3,333 bits. (Evolution thoroughly ignores the sunk cost fallacy.)

This suggestion doesn't preclude other hypotheses; in fact, I'm not even intending to suggest that it's a particularly likely scenario - hence my use of the word plausible rather than anything more enthusiastic. But it is a plausible one, which you appeared to be vigorously denying was even possible earlier. Disregarding hypotheses for no good reason isn't particularly good rationality, either.