Why do elephants get poached?

The main reason people poach elephants in the masses is profit, ivory is a big selling item in the markets, as its used for many things such as piano keys, knife or other tool handles etc.

but others just do it for fun, as most poachers do at some point, but they still take the ivory tusks and sell them.

or some might just poach for a collection of wild (un-cut/processed) ivory tusks.