why would you get married?

[KillerGremlin]

For religious implications?
Social implications?

Also, looking at humanity thus far, is marriage more good, or more evil.

One could argue that marriage represents social regression.

What about western ideas about marriage vs eastern ideas of marriage? What about Islamic (especially "extreme" Islamic) views on marriage? What about arranged marriages? What about the high divorce rates?

Why do brides wear virgin white?
Most do not deserve that right.
But to choose a color of their delight
Would surely bring on the frowns.
-Les Claypool, 1991

Edit: Just an interesting note, marriage predates historical records, so it has been around for quite a long time. And like all things spanning thousands of years, the context and meaning has changed quite dramatically.