It's not always easy to make the right decisions. Are you a gambler? If you're offered 1 btc without playing or 5 btc by playing (with a chance of 2 to 1). What do you do?
If you can afford to lose, the gamble might be more appealing, but if the loss would be financially crippling, the guaranteed 1 BTC offers a safe and sure benefit. Always consider both your financial situation and your emotional capacity for risk before deciding on such offers.