What constitutes a good tie changes with the whims of time and fashion. The thin, lightly lined tie of yesterday is largely out these days, and the thick, ultra-glossy ones that now command such a premium at Neiman are almost certain to be out a few years down the road. The trends in "weight," "pattern," etc. will all come and go, so buy what you like.
This is not to suggest that ties should not be made well, and of good materials; I'm just noting that what was considered a "good tie" years ago won't be found sitting next to the Charvets and Kitons of today. The heft, pattern, width, etc. would be all wrong. Yet that doesn't make the earlier ties bad, or lesser, except in that they no longer reflect the tastes of the high-end marketplace. Personally, I would not be caught dead in many of the typical offerings from some of the high-end makers.
As for price, it largely comes down to the makers asking themselves, "What's the most we can possibly charge for this?" Having a maker like Sam Hober around really underscores, in my mind, how absurd some of the RTW tie prices have become.