How do you guys get over gp loss of gear?

I've recently been debating if to get my first mega rare which is a shadow which I ended up buying yesterday for 902m.

Woke up today and saw it dropped -30m.

Regretting it already, could have bought an eye of ayak, confliction gauntlets, full ancestral, and a heart.

:O

How do you guys manage losing 100ms and billions of gp values lost in item