As Synisill remarked in his review, this card does not see a lot of play. Why is that? Certainly, the level 0 Emergency Cache is a pretty playable card. It provides useful resource acceleration, which lets investigators get expensive cards into play much more quickly by sparing you the need to use multiple "take a resource" actions. Some investigators have access to superior cards for this role (e.g. Mystics with Uncage the Soul), but for a lot of investigators, Emergency Cache is still the best level 0 resource acceleration available.
So if Emergency Cache is pretty decent, and Emergency Cache II is clearly even better, why do so few people make the upgrade? The answer is twofold. First, it is important to note that although Emergency Cache II is clearly a better card than Emergency Cache, it is not actually better at the core mission of the card, which is to provide resource acceleration. Both the level 0 and level 2 versions get you more resources with equal speed.
The second reason, and the more critical one, is that paying two XP for +1 card is a lousy deal. This is because, at this point in this game's development, every investigator has access to a huge number of cards that can simply trounce that. Take Beat Cop II. That's also 2 XP. Compared to its level 0 version, you basically get two successful Fight actions that you can use whenever you want. A successful action is much more valuable than a card, and Beat Cop II gives you two of them! Or take Pickpocketing II. You get the Fast keyword, which is almost always better than +1 card (consider that you can use the action saved to draw a card, if you want to), and you get a substantially more powerful effect. Or Deduction II, which gives you +1 clue (and +1 to a skill test). Again, far superior to +1 card.
And, of course, spending 2 XP on a measly +1 card will also slow down your progress toward the high-XP game-changers--you know, the stuff like Lightning Gun, Key of Ys, Shrivelling V, and Will to Survive--the cards that can just dominate scenarios. Those cards are absolute bombs, and there is no way that a slightly more efficient Emergency Cache is going to justify delaying them.
I won't list all the XP options that trounce Emergency Cache II in terms of efficiency because it would just be a list of most of the XP cards in the game. The fact is that spending two XP for +1 card is simply behind the curve. XP is precious and immensely powerful in this game, and spending two to get an additional draw isn't worth it.