Carolier is a damned big place, and unless you come in the same time and the counterperson is not insanely busy, I am not surprised they fail to acknowledge you.
DO you say, "Hello Drew, how are you doing today?" every time? Take 3 seconds to know him, single him out or anyone else there waiting on you and maybe he'll respond in kind, eventually.
I used to practice there 2x a week, same time, same days of the week. While some did remember me, others said the same to me that the said to you, "Need shoes", when I had a 4 ball roller sitting next to me. That's life.
Of course, maybe one day, you really pissed him off!
, without your realizing it.
--------------------
"None are so blind as those who will not see."