Oh. You like to keep your drinks boozy, do you? How totally unsurprising.
Alcohol starts to evaporate at 78°C, so when you simmer it to add flavour, you can lose anywhere between 4% - 78% of it.
We spend a lot of time focussing on getting the exact proportions of spices right and then simmer them for hours. The result is a luscious syrup that can be easily added to your favourite warmed red without having to heat the alcohol for too long. This means more flavour. Less alcohol loss from heating.