This is a good list for pipes under 200 USD. For under 500, I'd buy from an artisan anyday. Stem work for instance is far superior on my artisan pipes, drilling is spot on, draw opended as I like it,.. You can get a tailored pipe for under 300 USD, so if you have the cash why bother buying a factory one?
Eh, possibly because it's easy? You go on a website, few clicks and few days later and you have it. My best smoker is my very first pipe, a Savinelli 106 bought 15+ years ago, it's the simplest of the simple billiards, cost ~$45 and smokes perfectly. It's also my tasting pipe.
I also agree with Sigmund and OzPiper that $500 is quite a lot and adds many variables to the mix, the post's question is difficult to answer because at that money I'd expect perfection across the board which you get from either major manufacturers' top lines, or artisan, this is why I listed cheap options in my first post.
OzPiper I don't know old pipe prices (say '80s and before), but I'd struggle to think there were many $500 pipes back then, it's a lot of money in today's money, and a hell of a lot of money for the 80s - my rent in Coventry in the UK in 2010 even was 150 quid/month, my friends in London paid 300-400/month and that was considered a lot of money! Now for 400 in London you probably get a mattress under a bridge...