there are already multiple topics about this in this board discussing about this.
to sum it up, most people won't care much unless there is a ridiculously large bitcoin price rise like going to $5000 but with these rises nowadays, they keep on keeping their old habits. specially those who are earning bitcoin and the amount they are earning has not changed with the price rise.
you earn x then spend y and if you earn x/2 you can no longer spend y you have to spend y/2 too
You're not exactly wrong but the current high volatility is a real pain in the ass!
I was just playing poker on Fortune Jack, casino poker. The game is live (which is pretty cool) but the game balance is in dollars! That means that when you start the game your btc balance is converted into dollars and when you close the window it's reversed and your dollars are converted into btc.
I had a good session and went from 30$ to 65 so pretty cool. But I started the game when btc was low and closed it when it rised again! So even if I more than doubled my stacks I went from around 0.04btc to 0.075btc! So it's not
important but that still has some effects on the games ^^