I also prefer to use USD in my bets, in some cases I use Litecoin, but I don't use bitcoin, even when the rates are low, I still don't use bitcoin in my bets. I prefer to keep a certain difference between the funds allocated for my bets and the funds allocated for trading and hodl. Also because I don't see gambling as something that would give me profit in the long term, playing with bitcoin, I would be running the risk of losing bitcoin
I think most of us understands that betting with Bitcoin, there's a huge gap of it between the rest of the altcoins. It seems that the majority bet with USD, stable coins and some other altcoins but we'll not use Bitcoin for betting especially the ones that are from our long term holding. The higher the price of Bitcoin, the wanting we want to hold of it longer. But the time will come that it will be easier for us to gamble with Bitcoin when the price becomes higher and we can play with some satoshis on it as long as the amount is tolerable and won't jeopardize the risk of losing our BTC holdings.