There is no need in upping this card,
Upping the card changes it from being vulnerable to (nearly) every form of CC, including all forms of mass CC besides unstable gas, to resistant to many forms of CC, including all forms of mass CC besides pandemonium. It's a pretty useful improvement. However, I do take your point that it's less useful than other things, and I'd put it fairly low on the upgrade priority list for a lot of decks. If you have the
means though, it does benefit quite a bit from doubling its HP.