It can be all about timing.
Although some people here would prefer to describe that as making the right decision at the right time.
The example I like to quite about how timing can be everthing and that a decision which is a good one this year could be a bad on last year or next year is the experience of my father.
He bought half the blocks in our street just after the war. He owned 5 blocks on one side and 4 on the other. He sold one to Mum's parents and two to a couple of his uncles. He built house on those blocks for them. Then just before the change to decimal currency, he sold the remaining blocks for 500 pounds ($1000) each. I remember him telling me that the increase in value just covered the rates he had paid over those 30 years. Less than two years later he could have got over $5000 each.
When he bought a double block just out of Camden, he sold one half of the block just a few years later for about twice what he had paid for the two.
So was he a wise investor or not?
Sometimes you get the timing right; sometimes you get it wrong.

