@Jeirien
Sure, but it's not like etiquette is without reason.
If a noble pays people to open the door for them, or to dress them, it's a sign of abundance. If throwing away money can make the other nobles be on their own side instead of against (economically but also military), then it's still a saving. If everyone shows abundance and one stops, it's a sign they are weak and thus the others will try to take advantage of that. This means the nobles will try to avoid it even more, and if someone does stop, then they must be really weak.
Having always someone with the guests can be a form of politeness, but it can also be used to show that the host has people to spare, or to monitor the guests when they are within the property, or spy on them. In general it depends on the host and on the guests. I'm more cynical so I'd go for the 'to monitor' as bare minimum, but considering the story it's probably just politeness as you said.