But no lightning custodial address accepts 1,120,000 sats and hardly anyone has them on their Walletofsatoshi or similar anyway 

 Sure they do.  I have bought multiple pieces of art from Scarce.city over Lightning for way more sats than that. 

 And what are you waiting for to buy a painting from me? 🤭 

 Where are they listed? 

 Here 🫂
https://isolabell.art/#shop