Of course you can. Why wouldn't you be? The question we have to answer is: What can we be rich by investing? That's no easy way to answer. As an example of myself, I have been involved in various campaigns for about 2 years, but there has not been a campaign where I have been making so much money.
2 years is definately a long term but I've seen many people on this forum who earn substantial amount of money in just a few months. It's all of luck and campaign choice. If we choose a campaign which lasts for a year then definately we won't earn much.