Sure, you can service any loose bearing headset from here to the rapture... oh, and your bottom bracket, and your loose bearing hubs, and so on. At some point you realize you don't have enough time to service all of your low-cost but serviceable parts and sure wish you had something that just didn't need as much maintenance.

Now having said that, I have an almost 20 year-old loose bearing Fuji headset that is smooth as butter and who knows if it's ever been service. And I repacked an almost 30 year-old one that felt good as new with some cleaning and fresh grease. (Though in both of those cases, I suspect it's old but quality versus new and cheap--my Tange)