I think some believe this was the reason why Wal-Mart failed in Germany. They brought this "can I help you" with them and German customers rather went to Aldi & co where they could shop in peace.
Walmart? Are you sure? They are not known for being helpful, let alone solicitous.
Ironically, the only grocery chain that I can think of where employees actively ask if they can help is Trader Joe's. I can't help but giggle at the fact that they're German-owned, even if this part of the culture came from the American founder.
Oh I would also be very confused since Aldi is the pioneer when it comes to shopping in peace and w/o frills in Germany.