リーダーズ+プラス (has 来店者数)

I think it's OK.

@@ -12 +12 @@
-<gloss>visitor (of a shop or restaurant)</gloss>
+<gloss>visitor (to a shop or restaurant)</gloss>

km
来店者	1552

I think this would be helpful to include, even though it's not even in gg5 or eij (eij has some derivatives of it 
though, like 来店者数 and 来店者計数)
I put "visitor" first because a 来店者 isn't necessarily a paying customer, but I wouldn't mind putting customer 
ahead if that's what others prefer.