Although it is like that, my deposits are mostly in bitcoin, few times in ripple. These deposits are most of the time not just displayed but also converted into fiat. I do not like it if my wallet's value is constantly changing because of the volatility of Bitcoin or XRP.
I don't track my gambling expenses but I think that is a great idea.
Most common crypto used by majority is bitcoin since many want to see great volume earn while speculating some good price increase on its volatility. Sometimes also I use USDT since this is somehow called safe haven by some people when the market us in bad shape and don't want to gamble my bitcoins which I bought at more expensive price.
Also looking for xrp as alternative but for now my balance always converted between BTC and USDT only.