Since I decided not to chase the blue boxes and prizes this event, in my spare time I typed up some of my thoughts for your amusement
There are 1440 minutes in a day, so everyone has 4,320 energy points to play with each day... unless of course you play as IRAN with a 10% bonus, which means an extra 432 energy per day for you. It does not seem much, but if you convert it, it could easily mean an extra $100,000+ cash per day as a bonus if you are hitting the right missions. And this is an advantage you will constantly have over all other nations day by day, week by week, they will not be able to compensate for this in any other way.
Other nations will certainly reply, that their Air, Sea or Ground defense bonus is worth more than this extra daily cash. If you do the math, it is obvious that they are right - an extra $100,000 daily will not be enough for you to buy 10% more units than they have, especially not at higher levels. However, and this is the key to understand: you are not comparing yourself against one other guy of another nation, you are playing against a horde of players and there will ALWAYS be someone stronger than you. So unless you are they GOLD king of the hill, we can safely conclude, that no defense is enough... EVER
Now, if no defense is ever enough, then why bother at all? I say, money is king in this game and it is simply futile to waste money on defense, especially if you can vault all your money and if all else fails, invest the unvaultable money in defense buildings or palm tree parks until you need it.
Yes, when you have extra, unprotected money you can't fit in the vault you have two choices: either try to defend it with an army (hopeless, as there is always a bigger fish than you are) or you invest it in a building and pay a 50% protection fee for this type of storage. Yes, it is a hefty price, but what this way you can be certain that that (half of)the money WILL be available on demand when you need it. The alternative is to risk losing ALL of your money (and sleep over it) and you cannot count on it being there when you need it.
There is absolutely no reason to have more energy points than the longest period you spend away from the game daily (number of hours of sleep time to fill it to the max). The rest is wasted, when it could be used for more important things.
Now, originally, when I was thinking about what strategy to follow, I realized, that to spend skill points on ATTACK bonus is kinda stupid, as I can always look up the enemy profile and pick someone way way weaker than myself to make sure I can defeat them. On the other side, since DEFENSE skill ponts do not show up in the defense total ponts, having a huge DEFENSE skill will surprise the attacking enemy. I noticed, that 50 or a 100 defense skill points can easily cause an attacker to lose a few battles even if they have 3-5-10 thousand attack points over my defense points.
Now, I know that this will not fool the smart players, however, since my defense SKILL bonus will usually make them lose the very first one or two battles, this will certainly demoralize the enemy, even if they know what is happening. When I am faced with such a surprise, I almost always keep attacking, knowing that they luck is simply a defense skill bonus which runs out in 1 or 2 fights and from then on the real attack defense values will determine the fight. Howver, psychologically it is quite a deterrent to those who let feelings guide them instead of pure rationality
Oh yes... however, since I am about to reach whale territory, I am changing my skill points strategy because now I must look at the situation differently. Whales are not effected by my high defense skill bonus, as they will have twice or thrice the attack points over my defense, and no amount of skill bonus will make them lose even one fight against me.
Therefore, defense again is a futile excercise, and I must focus on making my attacks have as much success as I can.
So now, I look at attack skill points as the extra force I can add to raise my attack / win chances against those I am planning to attack. I can only spend as much money as I make a day to buy units, and besides the boost buildings, the skill points is another way to "boost" your winning chances.
Cheers and see you out there