can i invest 10$ BTC ?

As everyone has already said, you won't be getting rich with $10.

If you just want to play around and learn, $10 is probably worth the experience.

But why bitcoin? Will you really feel like you own any bitcoin at all if you're just trading through a marketplace, rather than having the coin actually hit your own wallet?

Also if you wanted to go that route, you should use a coin with a lower transaction fee.