interesting. but would depend on an artificial ivig being produced http://autoimmunenews.blogspot.com.au/2008/05/artificial-ivig-becoming-possible.html
as it is made from real blood and would, at current prices, cost at least usd75000 per person per year. as the source of real human blood is limited the price could skyrocket to the possibly terminal effect on poor people with auto immune diseases.
there is also the chance of contracting very nasty diseases through blood products.