the risk that you make by using real money is a part of the fun that is why they say to gamble with the amount that you ready to lose, there is no fun in gambling with no risk, the emotions that you feel when you are losing or winning is the real fun for me and so many gambler
Using real money on gambling is more safe than using your bitcoin, if you use fiat on gambling, you could not lose too much, but if you are going to use bitcoin, you are going to lose too much profits since its price is more high than the price of fiat, it is a wise move. But if we are going to look the other side, making more profits could be earn if you will use bitcoin(though the risk is higher) but if you are a lucky guy, then why not use bitcoin.