Well it's a bit more complicated. Sucker if you invest, the market crashes, and then either you panic and pull out, or otherwise need that money and pull out, and then don't get to ride it back up again.

OR... your country turns into Japan, where their main index is still below 60% of its 1980s peak...

It's a suckers game because at any given point of time, you are making a bet with the "hope" that the market will move one direction or the other.

I generally invest in the hope that the company will remain profitable, or become more profitable, and in doing so increase dividends to me. Capital increase would be nice too, but it's not the intended source of profit to me.