Yeah, but that's the thing right...
If you already have enough wealth, then sure, you might as well get the gamble and maybe get 5 BTC.
But if you don't have enough wealth, the certainty of getting 1 BTC will probably be the best bet to make.
To some, they will say they will go for the bet, but what you said is the best. If you are wealthy enough, you can go for the bet, but if you have less wealth, you probably need 1 BTC the most because having a small amount is better than losing everything. And again, if we are going with the present heart of a gambler, then I would rather go for the bet. Because anything in this life depends on risk, risking 1 BTC to get 5 BTC will not be a bad deal, but if I lose, I will be in great pain, and regret will normally happen because, as a gambler, you have to be used to all these kinds of losses, so it won't be a bad deal to you because without risk, your chance of getting rich is limited or based on luck, which means without risk, your chance of getting rich is 0.2.
Believing in yourself is one of the keys to success. If you are actually a gambler or someone who takes risks, you will find it easy to be the lucky person to win the bet, but if you don't believe in yourself, who will then believe in you? Again, everything is possible in this life, so don't think it can be possible. But even in risk, you have to go for the risk you can afford to lose. That should be your first priority.