EzekielRaiden
Follower of the Way
I'm fairly sure you're being tongue-in-cheek with the example, but the real irony is the double subversion that there is a real, historical religious tradition beneath the shallow modern perspective. Far too many forget that Zeus, despite seeming like the god of one-night stands and bastard children, was in fact really important because he was the god of hospitality. He was Zeus Panhellenios, "of all Hellenes," yes, but he was also Zeus Xenios, Zeus-protector-of-Strangers."I really want to be the best Innkeeper in all the Dales. Truely! Fluff down service and Continental Breakfast for everyone! This is my Oath!" Gains magic powers.
I would absolutely, 100% be down for a genuine Oath of Hospitality Paladin. That sounds pretty awesome--if done correctly. Because there is something of the sacred in the bond between host and guest, between a fearful traveller taking a risk that this host can be trusted, and a fearful host taking a risk that this guest can be trusted. I imagine the Oath of Hospitality would strongly encourage wandering, providing succor to others especially in the dark and dangerous places of the world, collecting stories and interesting things to give in reciprocity to future hosts, and (when it's time to end the wanderings) looking for a great place to show hospitality to others.
But that's why the Oath of Hospitality would be more than just "I offer really good service!" It is a life genuinely and fully dedicated to making the world itself a more hospitable place, and to recognizing, assisting, and even rewarding those who put in effort toward that cause.