How much Ethereum do you need to be rich?

Excuse me, could you possibly clarify something for me? I've been hearing a lot about Ethereum lately and I'm curious, how much of this cryptocurrency would one actually need to possess in order to be considered wealthy? I'm aware that the value fluctuates, but is there a general ballpark figure or perhaps a metric that one could use as a reference? I'm trying to get a sense of the scale involved and whether it's a realistic goal for me to pursue. Could you shed some light on this matter for me?