Only spend what you can afford to lose, is a great motto. If you're on your last $25, I wouldn't suggest it. If it's just life is tight, but you can lose that money then sure. I mean obviously you're not going to make a million dollars in 5 days, but you will (if the price goes up) still make a profit the same as everyone else.
My other half invested A$1k the other day, today he has a holding worth A$1130. $130 profit isn't a lot to some, to others risking 1k is a big risk.
If you invested the same day as him, you would have a $3 profit, which isn't a lot to some people, but to you that might be heaps.