I get your point, harold, and I think we agree more than this discussion would let on. But I also think that a LOT of horns aren't the stuff of restorations; they are commodities. Take a Miraphone 186. There are zillions of these around -- enough that, even if they ever DO quit making them, there will be plenty of parts available for a LONG . Now, suppose I've got one, and I decide I want to... oh, let's say I want to add a slide kicker. It may look like hell to you, but it works. What have I really done to the horn? I've soldered a mechanism to some slide tubing and a slide crook. All reversible, and in the worst case the parts are replaceable.
But even to take an example more like yours: let's say I've got a turn-of-the-(20th)-century York, and there's a hole in the leadpipe. If I could afford to (money and time without my horn) I'd take it to a great repairman like bloke, who has done some fabulous work on my trombone. But suppose I can't afford it, or can't do without the horn. I go down to Lowe's, find some sort of sheet brass, cut a suitable sized piece, form it to the shape of the tubing, and (sloppily) solder it in place, well enough that the horn plays satisfactorily. Five years later, I sell it to you. You can see that the leadpipe has an ugly patch (and if it wasn't visible, I'd make sure you know about it). So you decide to have it fixed right. You take it to whomever, they remove the patch I put on, and there's the hole I was dealing with five years earlier. It matters to you, so you pay to have Oberloh -- whose pictures reveal to be extraordinary and somewhat obsessive about perfection -- patch it by cutting out the bad spot, brazing in a perfectly matched piece of brass, blah, blah, blah. You wind up with the same quality of repair as if I had hired him to do it. The only difference is that YOU paid for it -- which is appropriate, since it is YOU that place that kind of value on the horn being repaired to look like new.
I do understand, mind you. I'm that way with my '66 Mustang. I don't want things patched with Bondo and painted over, or rust holes in the floor pans cut out and covered with patches; I want them repaired RIGHT. Nor do I want digital dials and fuel injection; I want it to be like it was when it was new, AM radio, no A/C -- like new. It matters to me. But I'd never criticize someone else for going with the cheaper option, or for modernizing their car in some way that I'd not want; instead, I'd be glad to see them appreciate the car the best way they can, and be glad that it's not just gathering rust in a junk yard somewhere.
Oh, and on my '66 Stang: I do my own engine work, even though I'm NOT a professional mechanic, and have never received ANY training other than reading a Chilton's manual. Here's my Mustang engine, just completed a couple of weeks ago; what do you think?

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Joe Baker, who thinks we aren't SO far apart....