Why wouldn't you buy $BTC at $70k if it's going to $300k?

Fair question. The answer isn't about the destination — it's about surviving the ride. Spot accumulation works when you size so you don't panic-sell at $50k or $40k on the way there. If you're convinced it hits $300k, then buying at $70k is fine — just make sure your position size lets you hold through the inevitable drawdown without losing sleep.

Just buy Bitcoin. But buy it in a way that keeps you in the game when volatility spikes. That's the whole process.