It is not just milk boiled with the spices that are at hand and some tea leaves. It is real sustinace for a lot of people far below the poverty line. A thick and savory muddy looking liquid, rich in calories and it makes shitty situations somehow fine.
You can not quite have it like that in the west, the combination of aniseed and other spices even create tiny amounts of amphetamines, so it packs a little more punch then just caffeine.
It's never quite as thick or flavourful in the west and probably contains no further stimulants except caffeine. So it will be much more boring here and probably way overpriced.
I tried to make it myself, but it was never any good. Even in India some chai is worse then the other. The dirt cheap ones people hand out in trains can be way better then the ones in a 4 star hotel.