I think small investment does make sense for new investor that are new on investment, investing huge amount of money without any experience is a very risky decision to make as he could have a high chance to lose large amount of his money due to bad decision made.
Yes, it's a good experiment to start a small investment and check the averages. This way you can have some idea how good is the investment by looking the percentage you are earning from it. Usually this calculation is made every week. If you think it worth you can deposit more money and start an investment for real. Small investments make sense only this way.