Many of the sites allow you to delay your payout until it builds up to an amount you
prefer to withdraw, which is in their best interest as well.
I have never had any problem sending any of the BTC I have gotten. Let it age, and
you can also add it as inputs to transactions involving larger amounts.
And of course don't expect using these sites to be a way of getting rich.
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
Its just a fun hobby for many... and:
What good is it if one only gets very very small amounts?
https://bitcointalk.org/index.php?topic=74046.msg1088930#msg1088930