Yeh, and when you've been going there for the next ten years, they'll not only not look at you, they won't even offer you a cuppa.
At Christmas I notice it's only really my newer customers who tip me. My old ones just take me for granted and treat me like an old sock (the sort we blokes use for nefarious purposes).
Shame really. I wish my customers watched me a bit more.
Seriously, once you win their confidence, they won't even check their windows, never mind watch you; apart from the strange ones. And it's interesting to watch; it's new to them. They may just be taking an interest.