Having said that, I'd actually not call merit source duties as their/a job, I think it's much better to say it's their own contributions to the forum. 
A community initiative that some applied for while others were selected for it based on theymos' own criteria and selection methods. I had out merits in a similar way as The Pharmacist does it. I just go about my business of reading and writing posts and I merit the good ones I find in the threads and sub-boards I regularly visit. That's the simplest way to do it. So far I have always succeeded in emptying my bags at the end of the month.