That's interesting. I would have no idea what someone meant if they said "top-drawer". In bars, "top-shelf" means the expensive booze, usually contrasted with "well", which means the cheap stuff.
Yeah, here in the US "top-shelf" is usually used in the context of alcohol. All of the really good stuff is top-shelf (usually literally) and the well stuff is the garbage in plastic bottles.
Keep the really good stuff up high and visible where everyone can see it.