Nothing is easy, your perception is wrong that people easily grow their BTC, they earn by their work and ability.
BTW there are few ways to grow your BTC like trading, gambling , mining etc. Mining is low profitable than other two, while gambling involves high risk so i will not suggest you to do gambling. Trading is in fact the best of all, you can earn huge profit if you are aware of the market and have a bit knowledge about trading.
so true. sometimes we see a huge income from someone, and we think that we get it easily. but, nothing is easy. all that takes effort, moreover in increasing revenue. if you want to try trading, then it's a good thing, but it takes a lot of hard work on it, so you can earn, or increase the amount of money you have.