I agree they are over priced, but the point you are missing is that the Fins used Mosins as the base for most of their wartime rifles and being a relatively small country means there are a relatively few of these guns available and thus, are very collectible.
This is the email that I received from J&G. At what point did they take Mosin out of the description?
FINNISH MOSIN M28 TARGET RIFLES NOW AVAILABLE !!
These rare and unusual rifles from Finland will enhance any military collection! They are Finnish built target model 28's called the 28/76, using a Russian Mosin design receiver, a 27 inch barrel (some barrels may be Sako), a fully adjustable diopter rear sight with globe front sight, and a heavy target stock, with palm swells, accessory rails, and checkered buttplate. Also has a 2-stage precision trigger, and a bent bolt handle too. The were adopted as target rifles and adapted from the original M28/30 rifles. An interesting piece of history, now down to $949.95 each.