That would only work if you knew ahead of time you were specifically looking for that particular location. There's been plenty of times I've driven by some place and decided to go take a peek inside just based on their name alone.
If 'Al' wasn't able to put his business name on the building (or advertise in any form), then he'd probably not make very many sales.
It surprises me where the conversation has gone -- this being HN and all, we're mostly startup/biz/tech people round these parts.
I guess plain signs reading "bakery", "clothes", "cars", "hipster coffee", etc. could be allowed if you try this.