I suppose if the combo tincture was prepared with all three herbs in alcohol together that might make sense. Does it say that it's a higher ratio on the combo tincture 1000Daisies? Say 1:2 instead of 1:4 or 1:5?
Otherwise I'm confused that it would work this way too
I've taken different herbal combinations over these years, and I've never ever did these higher doses by trying to "add up" the single herbals. It's never been recommended per the doctors/medical practitioners, bottle label, instructions, web information, etc. Some of these combinations have over a dozen herbals in them (and if you did the individual calculations, you would be taking an insane amount of this stuff if you went off-label -- wouldn't you seriously be over doing it dangerously if you did?).
Look at Byron White herbals - they aren't going over 20 or 30 drops (??), and they have a LOT of individual herbals in them.
FWIW - if you want to look at ratio, just look at any of the Byron White labels or even Woodland Essence combination herbals.