I have a bit of experience with this.
Probably the first thing that I learned was that the quality/pedigree of the mic's and preamps is secondary to the treatment and/or acoustics of the room being recorded in. It is very possible to make a quality recording using a $100 mic and an off the shelf USB pre if mic is well placed and weird room deflections are accounted for, and no amount of money spent on mic's and pre's will make up for sound deflections and/or bad mic placement.
I have recorded samples in my living room before. Close mic'ing is necessary, and I still have to throw a blanket over the tv or those deflections will translate into an unpleasant warble effect on playback. I do have access to a cathedral locally. In that case, one is just as much recording the room as the guitar itself. In this case, putting some distance between the mics and guitar is desirable, but it takes some experimenting; both finding the sweet spot in the room and then getting a good mic placement.
Here's a recording I made in a controlled, studio environment with close micing and reverb added in post:
http://www.kenwhisler.com/wp-content/up ... rgigue.mp3
Here's a recording made with the mics @6 feet away in an old and reverberant midtown parish:
I like both recordings, but they are different.
Here's a recording I slapped together in my basement with the same guitar......threw a mic in front, hit "record", added some reverb, done:
https://soundcloud.com/ken-whisler/o-sa ... ow-wounded
That recording is not bad, it achieved it's purpose in the time I had to work with. If I were using that same recording to help -sell- the guitar, I would have spent some time putting up sound treatment and placing the mic, and I'd have left the recording bone dry. Which I have done before.
Yeah, I am a proponent of providing sound samples, but if all one does is slap a mic in front and go, that's not good for either the luthier or the customer.