I don't have the resources or the time to visit actual instruments, so I'm afraid that my responses will "skew" your poll a bit.
But I'll give this a shot.
1. Definitely yes. I would love to go hear some of the organs - especially Steinkirchen (Even among Schnitger organs the sound is quite special - in a good way!), Stade, Walterhausen, Kampen, Ottobeuren, Midwolde (I really like this instrument too, but the sampleset isn't the best), Krewerd, Buttforde, Prague Teynkirche etc.
Some samplesets also introduced me to organs I never previously knew of, such as Heuden, Rozay or Krzeszow. I would gladly visit those instruments too.
2. No, for the reasons outlined above
I would love to, though.
3. Yes....? I do have quite a lot of Organ CDs, and have ones of organs mentioned above such as Stade, Walterhausen, or Ottobeuren. But the choice is usually informed more by playing than the organ (But there are exceptions when I love an instrument so much that I get all the available recordings I can have my hands on; for instance, I did this with the organ in Midwolde (a sampleset) and Uttum (not a sampleset) and never regretted it)
However, for some other instruments, well-made CD's of them are rare and hard to obtain, especially in the US. Such an example is Steinkirchen - I have one or two CD's of the organ (Could have more if I was a fan of E.P. Biggs and didn't think that his playing as mind-numbing), but I never knew that this was such a marvelous instrument before I heard and tried the sampleset.
I think Hauptwerk can indeed do more good than harm to an instrument's reputation. We all hopefully can agree that while our digital toys are fun (and the best we have), nothing can match the actual experience of being in the same room with a fine and famous organ, and such instruments will always have their fans. Often times, a Hauptwerk set, by drawing attention to a specific instrument, can actually increase the fame and renown of that instrument, and even perhaps draw in some cash for the owners (think how the restoration of the Smecno organ was funded in part through sampleset sales, and Sygsoft also donates some of the sales proceeds to the parish). It's easy for CD's of a given organ to be neglected and eventually hard to find, but as digital media, samplesets - and the sound they produce e.g. on Contrebombarde - will live on.