https://btc-e.com/betsI really don't understand this. They are letting you bet on what the price of bitcoin will be in 5 minutes. How is this fair at all? Could a whale not bet and then buy/sell to take everyones money?
My friend, just stay away from those sites, unless you can predict it every now and then.
They just going to get what you have saved. You hard earned money is at stake if you invest in these type of sites. So be careful with them.