Are you talking from your own experience? I am. I made a million dollars and it wasn't easy but it was actually a lot more difficult to invest $1 million and make more money with it. I personally found it a lot more difficult.

I think most people greatly underestimate the difficulty in investing money successfully.

If you are talking about the amount of time invested ... yes of course there is a lot less time spent investing. However if you are talking about the probability of success I would argue It's not as high as you would think to take $1 million and turn it into $2 million.