Joined: Jan 2009
Posts: 44,303
Likes: 6,561
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
For all an IGH's substantive advantages, and there are many, it will always weigh more than a derailleur system, and I expect it will cost more. The differences are small, but they are a barrier to both sellers and buyers.