Do you believe in Karma? That there has to be 'balance'?
It is fairly self evident that there is no such thing, we look for little things that indicate that there may be 'balance' or Karma in this world, we do a good deed and something nice happens, but are we looking for that something nice because we feel we have earned it? When bad things happen we look at the culprit and wish 'Karma' upon them, but it is just wishful thinking.
How often do we hear of someone getting their just desserts? Not that often, we want it to happen because deep down we want revenge, pure and simple, wishing Karma existed is really just another way of wishing for retribution upon a, in our eyes, wrongdoer.
We like Karma when its good, we want to believe that if we help someone we will be rewarded in some small way, but this rarely happens, the best bit is feeling good about yourself when you do the good deed, why should a 'reward' be necessary?
Doing a good deed should be reward enough, wanting Karma for it is selfish, but how many times can you say you have done something good and not expected a bit of karma back? Or even more.
There is no balance, things happen and then other things happen, there is no rhyme or reason for it, other than cause and effect. Some families have loads of bad luck, some have good luck, most just cruise along in an average way, the good and the bad are purely ends of a spectrum that must exist to show the mean.
If there was such a thing as Karma, I think someone would have proved the concept and bottled it by now.