The problem is that you can't just add in the x3 part and have it work out. Sure it makes your math pretty and clean but thats just not how it works. Redo the math with the base assumption as 3Kb and I'm fairly sure you'll get a different result.
Wow you're the one who sucks at maths. His calculations is only a string of multiplications. Don't you know that multiplications give the same results no matter the order in which you do them?
It's one thing for one person to be crappy at maths and trying his best to calculate something anyway (which he wasn't, since he refactorized-in the x3 factor near the end of his computation). It's quite another thing to tell others they are bad at math, while being even crappier yourself -- because you run the risk to pass off as an hypocrit or a moron, and neither is a very good outcome.
Learn to read better before telling others they are bad at what you're bad yourself.
That being said, I think the original poster's idea has a lot of merit and I fully support it.
However, some kind of algorithm should automatically "analyze" all skin changes for contrast and color variation in time. If a stroboscopic effect is detected (very quick high-constrasting color changes), the skin change should be refused. This would prevent a lot of epileptic seizures, of which some young children can be very sensitive to.
"Dennou Senshi Porygon", literally "Computer Soldier Porygon", though most commonly translated as "Electric Soldier Porygon", aired in Japan on December 16, 1997 at 6:30 PM Japan Standard Time. 20 minutes into the episode, there is a scene in which Pikachu stops some vaccine missiles with its Thunderbolt attack, resulting in a huge explosion that flashes red and blue lights. Although there were similar parts in the episode with red and blue flashes, an anime technique called "paka paka" made this scene extremely intense, for these flashes were extremely bright strobe lights, with blinks at a rate of about 12 Hz for about 4 seconds in almost fullscreen, and then for 2 seconds outright fullscreen. At this point, viewers started to complain of blurred vision, headaches, dizziness and nausea. A few people even had seizures, blindness, convulsions, and lost consciousness. Japan's Fire Defense Agency reported a total of 685 viewers, 310 boys and 375 girls, were taken to hospitals by ambulances. Although many victims recovered during the ambulance trip, more than 150 of them were admitted to hospitals. Two people remained hospitalized for over 2 weeks. Some other people had seizures when parts of the scene were rebroadcast during news reports on the seizures. Only a small fraction of the 685 children treated were diagnosed with photosensitive epilepsy.
While animated skins would not generate that level of seizures, they still could easily create smaller ones. I know that any kind of "strobing effect" immediately gives me quite the headache, so yeah such a feature, as nice as it may be, would definitely need some kind of built-in safeguard. Saying "server staff would just have to ban players with such types of skins" is no good: the damage would already been done, and we're talking about real health effects here, on real persons, not merely blocks being broken or stolen in a virtual game...