I don't. There is a whole booming industry right now in relabelling mass produced spirits and marking them up.
Now older whiskey for instance is going to always cost more than younger, and its usually going to be better, but you can get similarly aged whiskeys produced with the same or similar mash bills from the exact same facility that vary dramatically in price.
I suppose I should have narrowed what I mean by whiskey to scotch-from-scotland, as price very much lines up with quality for scotch. The same is true for mezcal-from-oaxaca.
The current trend of "craft" distillers relabeling factory made bourbons and ryes is a different animal.
There are fewer out-and-out fake scotch whiskey products; I can't, for instance, think of the Scottish equivalent of Templeton Rye.
But that doesn't mean price and quality are aligned. There are good deals in scotch, and there are bad deals. There are mediocre scotches that command huge prices for their brand. There's a sharp trend towards no-age-statement scotches clearing the way for more like that.
Also: part of the reason there are fewer fake whiskeys in Scotland is that they're practically all owned by Diageo and Pernod Ricard. Within those corporate families, distilleries are outsourcing a lot of their grain production, malting, &c. The stills themselves are mostly software-controlled. The median scotch is probably better than the median bourbon, but there's a case to be made for bourbon having higher highs.
There's also a trend towards startups lighting up silent distilleries in Scotland, so prepare yourself for craft scotch as well.
Now older whiskey for instance is going to always cost more than younger, and its usually going to be better, but you can get similarly aged whiskeys produced with the same or similar mash bills from the exact same facility that vary dramatically in price.