0, None. No.
Just don't do it.
I really dislike hearing all the people asking about, people telling them not to do it, then complain they got got involved in a scam and got burnt.
That I understand. But that is also the reason I would like to buy in small amounts, stacks of 100 or $5-10 at a time and that sort of thing, I am by no means a large scale trader/miner.
Anything within reason anyone?