Bitcoin has had quite a few periods of stability lately, where it has stayed in a certain range for weeks on end, so if I was just gambling with money earned during a particular week then it wouldn't make much difference. However if you have a big sum of money stored in a wallet that has increased in value substantially over the last few months, since it bottomed out around 16k, then you might find that taking it out has easily doubled your money without having to risk anything at all. Ideally though, you should be gambling with units of currency that have a pretty consistent baseline value and are not susceptible to massive spikes or busts, because gambling is hard enough without that element of uncertainty.