I don't want a Rivendell particularly badly [or I'd own one], but I can't imagine why anyone would argue that owning a Rivendell and owning a LHT are equivalent. They are different on a number of different levels - including stuff like the social groups that have formed around the companies that bike ownership allows you to participate in.

If you like a Rivendell, the lugs, the paint, the ride, the Rivendell club, etc.. Go for it. It's your money.

The argument could go the other way with a Windsor Tourist owner asking a LHT owner why bother waste the extra money on a boutique brand like Surly? After all they both have two wheels, you can tour on 'em, they are mass produced overseas, but one costs way more.