Because markets are irrational and you can get more sats by DCAing
Discussion
So I assume you don't believe in Bitcoin succeeding and that FIAT is a great currency? Or what makes you believe that you get for $10000 in 4 years more sats than you can get today?
No, I believe markets are irrational. Many people are calling for a recession in the next few quarters. If that happen, markets naturally move away from risk on assets. While true bitcoiners realize that bitcoin really isn't a risk asset, the market doesn't yet. The price of bitcoin will drop asking with other risk on assets. If I go all in right now, I'll miss that opportunity to get cheap corn