The USA might be the centre of the world (it depends how you draw your maps) but it is not the only country in the world. There are millions of students, mathematicians, statisticians, scientists, engineers and computer scientists around the world who use mathematical equations. Mathematics is *the* universal language and needs to be supported. Its not about latex - latex just happens to be one of the most popular ways to write maths equations.
+1 The important thing to consider is not just the number of people who need it, but also the seriousness of the need for the people who do need it. Currently there is no way to make notes including mathematical equations. It is not just that people want "latex" support - they *need* math support, and latex support is just one of the most popular markups for mathematical equations.