Don't know why but I'm a little curious here. What will you do with 30$? buy some more shitty domains? How will you be able to return $50 in 10 days when you won't able to arrange $30 in your life?
Honestly i don't know something that can double your money. The only schemes that "promise" something like this is HYIP's, Ponzies etc craps.
I hope that Op doesn't want to use these funds (or any kind of funds) to join such scheme...
