Wow, to each our own and that's fine! but.....
"Nowadays, amplifiers are relatively dirt cheap"
And they probably would sound that way to my ears. Sounds like an amp is an amp to you!
I suppose you couldn't understand why someone would pay $10,000 for a 10 watt amp?
"Oil filled Caps"
Caps have come a long ways to my ears. And none are universal IMO.
"Hand-wound toroidal inductors"
The last thing I'd use, the iron cores have departmental effects vs Air Core designs and then again not all air cores being equal by any-means.
"Resistors"
The technology like that in the Duelund with negative temperature coefficients has taken resistors to a whole new level, just ask many of the high end manufactures that are using them. I nearly took the Ohmite wire wounds that I was using and threw them in the garbage after hearing the Duelunds
"Myriad of T&M equipment"
I do as well, I have Electrical Engineers l work with everyday too, but I trust my ears more.
"I only use active crossovers"
Outboard I bet, to much in the signal path for my tastes with every gain stage (or Op Amp) a form of compression to my ears. The real way to do it is in the amplifier for me, which cutting edge DIYers like to do using existing RC components between gain-stages to achieve there goals.
But to think that a passive network can't do the job as well means you haven't gone far enough IMO an example
http://www.audioasylum.com/cgi/t.mpl?f=hug&m=147282
Go and read some inductor FAQ's here
http://www.northcreekmusic.com/COILS.html
If your into moderately loud music, then as Dr. Bruce Edgar one of the worlds foremost horn experts has said simpler is better and I agree. But then if your into the very loud more complex networks are the order like ALK's ES networks. But even ALK will agree for lower levels the simpler networks excell over his ES networks.
Cheers
SET12