I'm sure this topic has been covered, but I couldn't find it. Is it really worth trying to save blue cartridges and refilling them? I have like 10 sitting around. Saving these things seems pretty cheap, but hey if its worth it. I know these things aren't like most other cartos, cause other brands tell you its fine to refill. Blu says you shouldn't refill, so I'm asking people who have actually tried. Thanks guys.