How do they come with these quantifications that something is 3000 sweeter than sugar. What does that even mean? Cool find though, I hope it works - in the past it's seemed that while you may be able to fool your tongue, your stomach and brain are not so easily fooled.
I imagine it's the same way they measure scoville units.
It's sensitivity.
How much of the substance is required for a group of people to consistently correctly guess which of two identical water glasses have been spiked with the substance.
If it's like this then 1/3000 is required compared to sugar.
Could be the size of the molecule that will activate the relevant taste receptors, or the number of active molecules in a given volume of product, or given weight.