I have a customer looking for a 72" wide plotter... He only needs black, and fairly simple lines (patterns for cloth cutting). The only thing he needs is accuracy, he prints 72" x 100' (yes feet), but it needs to maintain the accuracy +/- .005 over the 100'. Parts are small (around 2' x 2') so they only need to maintain accuracy to each other.
I don't think the accuracy will be an issue for most new plotters. The hard part is finding something that large that is not made for outdoor signs and such.