It is possible to specify an overpayment of network fees. For example, here [I've paid 999 stroops instead of 100 for a single operation][1].

Does this benefit the sender under any circumstances?


  [1]: https://horizon-testnet.stellar.org/transactions/9f25912fc44995fe96048d89af6b662fb78ff6988daded1a181e96309e5ef3c8