Let's assume someone have exchanged 1000 usd fiat to btc and placed bet and got 0.60 BTC. After holding this for couple of months, BTC crashed to $800. What will be the profit? When you are comparing some pros of a system, always think about the cons too. Otherwise, you will default on your system.
He will go for holding his bitcoins
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I believe that does not a criteria here but his plans of multiplying his bitcoins through gambling is the biggest concern here. I am sure that he will be successful with his attempts as gambling will never let you move away with profits but with only frustrations.
Gambling will possibly increase your bitcoin if you win, but you are also entitled to loss as you are not god who knows the outcome of the game.
This is the actual cons where OP must need to look at. I am not sure about his gambling strength nor his betting capabilities. But, speaking in general that all gamblers do enter into gambling with at most confidence levels and this over-confidence block their eyes to look for pitfalls of the their plans by making their bran to fade away. Overall, the lessons we have learned throughout gambling discussion board must be,
never plan your future based on gambling as your luck is not in your favor all the times.