The problem is not how much money you put into it, but where you put that money. I would not even consider it an investment, unless you're referring to casino bankroll.
Amount matters but if you really don't have that much and the only amount you can invest is small, it's fine. Just make sure that you know what you are doing. And when people are investing small amounts, they really don't care if they can grow it or not, because they will always tell "don't worry about it, that's only a small amount."