That is a fair point, but what about product domain names, e.g. shirts.com, beer.com, etc, for companies that sell those specific product types?
But if you were making a website to sell shirts, you might reasonably ask whether it's worth it to spend the money to buy shirts.com or to pick a more affordable name and save your money for other things. If you're a startup and shirts.com is in your reach, then you have a surprising amount of capital for a startup that hasn't launched -- why do you even have that much?
I think that's the issue at hand.
The fact is domains like that get no real traffic unless you promote them massively. Their main worth is in selling them on to other domain whores.
The only time you'd buy a domain like that is when the benefit you'd derive from it is greater than the price; However when the seller hears of your offer to buy it, goes to your website, finds out how much you'd benefit from the domain, the price would go up accordingly. In other words, only when the seller is clueless.
Same reason why Groupon in Australia was called "Stardeals" once upon a time, on a domain called stardeals.com.au.