Not all Lightning wallets are the same. Some have a setup fee because it does some technical lifting in the background to make it fully self custodial, such as Breez, or Phoenix, Mutiny, etc. Some charge a high fee because they're not true Lightning wallets but function as one, such as Muun.

If you used Wallet of Satoshi or Alby, you'd have no setup fee and have cheap transactions all of the time. But the caveat here is that they are custodial wallets.