Ok that's about what I would offer in the shop and here's why...
Yes the parts are worth more than that but I would either have to rebarrel the gun adding another $250 plus to the cost or I would have to hold the parts till someone needed a ??? Hammer, sear, stock, ect and sell it a piece at a time over what may be years. I have a drawer full of T/C parts bought like that over the years and some I may never sell.
This isn't gouging it's just plain practical.