I kinda think the big reason lens designs like planars and plasmats are the rule today are beyond performance ( which is, of course, wonderful ) but ease of manufacture.
Fewer cells to center and cement than old classics ( sonnars, dagors ) and suitability to computer guided milling machines to make drop-in mounts.
Wisners Convertible Sets should give an idea how much it costs to makes lenses: a good old design ( plasmats... better known today as symmars, for schneider only copied the best ) made in low numbers.
The problem in looking for bargains is that the same cost of mortgage, health care, money, food, shelter... all that stuff is high. Any one amongst us whose livliehood depends upon on photography understands the difficulty of making enough money to live next door to one of his clients !
A craftsman, ( be it a photographer, camera maker, or lens maker ) has a harder time today than ever since so few people actually make anything anymore. And the awareness of the true cost of Work has been generally lost amongst us. Cheapness is everything.
( I guess this is becoming a rant... I'll be quick ) The eagerness with which we buy bargain chinese cameras rather than a Wisner, Canham, or Gandolfi ( fine cameras made by people tied to our own economy ) is apalling. Yeah, we're all poor / broke / starving / paying a mortgage / student loans / feeding kids yet we whine every day about the decline of Analog tools and materials. We don't have much say over Kodak, because we don't have enough money between us to make a dent in theireconomic needs. But we are the bloody marketplace for Ron Wisner.
OK, end rant.
That Protar V ( 1912 price $73 ) converts to $1435.35 ( AIER calculator
http://www.aier.org/cgi-aier/colcalculator.cgi ) in today's money. Still stiffish.
My 1910 18" Portrait Unar ( yeah, baby ) was about $350 when it was made. Today, that converts to just a bit under $7000.
The calculator doesn't take everything into consideration. That portrait lens exceeded the per capita income in the US by about 20%.
Corrected to today's money, it probably only exceeds the income of photographers !
.