Originally posted by Ryzilynt:

Lets be honest, most of it is easy peasey. Making a wolf howl less? While perhaps enjoyable by many, not that involved.

It's like taking a well written novel, then changing the names of the main characters. Giving them different clothes, and then adding a twist about zombies at the end.

It is not hard to simply swap assets or change values, but you are neglecting the much wider scope of modding in general. It can be just as taxing as developing the game.