I understand that it was likely not the same in every English-speaking place (rental shop makes it sound like you may be in the UK?), but it was very common usage in the US. It was also used this way even for video rental places that pretty much did nothing else other than rent videos. I don't know what the origin of this usage was though.

The point that I'm making is that in the eyes of a theoretical jury or judge, this example would be an easy way to demonstrate that "store" didn't imply that you were actually buying the items in it. Like I said, I agree with the intent, but just don't think it would fly legally. But who knows, I'm not a lawyer!

I do sincerely hope that if it were to come to the point where a court agrees that consumers are not actually "buying" the items, that they will force the vendors to stop using the terms "buy", "sale", and "purchase". But who am I kidding, that probably won't happen.