Unless the service is really exceptional, I mean really doing something special, why does anyone tip? Is it out of pity for people doing low paid jobs?
The US is different where paying people a minimum wage is like resurrecting chairman Mao.
Ireland would never have joined the Axis, that is very far fetched even for an alternate history thread. But if they had, all they had to offer was there location. Certainly couldn't have contributed militarily.