I think it's a matter of cost. Buying enough plastic for one kit here or there ups the cost and many don't want to pay. Even FX does them in runs. This is why 99% of all TX's seem to be 100% FX. Hopefully buckets like this will convince many to start moving away to more accurate helmets (even MRCE). And, if we're lucky, perhaps even considering painting their armor.
Us TK's are actually lucky. Every single clone has to be painted, regardless of HIPS or ABS.