I think at this point they've completely abandoned any pretension of sense when dishing out the daily challenges. When they took over the reins they had a few days where the challenges were bumped up to 10k each, which pointed to a sane future for the system; since then they've reverted to shockers like the one you've just described. Who in their right mind would grind out that challenge for a paltry 2000 credits? I need three and a half million credits to hit Reclaimer...
I can only think they stopped paying attention to it after they implemented the custom challenges system.
The custom challenge system can net you 5000-8000 extra credits while you were going for that FF challenge, easily, but it's still a hassle. If they just doubled-tripled payouts I think most people would be happy; at least at 6000 credits it starts feeling like something more worthwhile.