you should have posted this some 2 weeks ago..
now im already in there so i cant get this 0.1 btc..
0.1btc is a good deal for those who register [if they get something at all:)] because person who reffers someone gets just 10% of tradehill's commision from trade: so if your ref. buys say for $100 ,he pays 54 cents to tradehill commission and person who reffered him gets 10% of this: so 5.4 cents.. = almost nothing
0.1 btc is worth $1.7 - if im not wrong, your referral would have to make more than $ 3000 trading volume before you get payed back your 0.1btc
ps: my 5 refs in 2 weeks produced huge benefit of 0.016 dollars for me
good luck with this