Hey Peter,
I pay someone to greet my guest, $10 an hour before 10pm, and $15 after. Some of the local greeting services such as Proprly.com also charge more after a ceartain hour. I include these fees in my cleaning/prep charges, and make sure that this covers the most costly scenerio, which in this case amounts to $5 - $10 more (at most) per guest. In my experience this cost in negligable to the guest and I have never gotten any pushback. They understand that there are costs involved in cleaning, prepping, greeting, and I imagine if I were to get any pushback on my prep fees, going from say $65 to $75, then that might be a red flag and I may want to avoid that guests all-together.
I hope this helps.