Interesting Fact - Starbucks

According to Starbucks’s website, you can order over 87,000 different drink combinations at their outlets.

(This isn't that surprising when you realise they have 6 different sizes for coffee:-

From the smallest, the demi, through to short, tall, grande, venti, to the largest trenta.

Why did they have to make it so complicated?  What's wrong with S/M/L - small, medium, and large? )