I believe you're just spending the Sats, so it costs nothing. You could transfer to a different wallet address you also own I presume.
This is what AI says:
Ohhhhhhhh. So I can lightning myself 100k to my Satoshi wallet, then I can mainchain it back to myself? That's freaking weird. I guess I'm still figuring out this lightning stuff. I'm not sure if this is an idiosyncrasy of Lightning or just how Wallet of Satoshi does verification for their domain service or something. Huh.