There are numerous of people working on and for ET day and night, without a single penny paid
As a mapper/scripter myself, it's about passion, creativity and a hobby for the game. I wouldn't pay anything to anyone to make something for ET, because if he/she never intended to make something for the community without being paid, he's working without any motivation other than money.

Good riddance I say

The only way you can thank/motivate those people mapping and modding is by showing interest and playing the game