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Gunston Hall:  Your sporterized Krag has a Redfield 'no-drill' model 102-k commercial peep sight on it.  This sight is worth $75 to $100 with its attachment screw.  If the bore of your rifle is good,  you have a useful sporter/shooter worth around $300, as is, to some Krag enthusiasts.  Its value is strictly utility and parts.  Some of us like the old 'Deer Rifles'.

I will throw in my thoughts on this one, too.  As one niche in my Krag collection, I have a soft spot for different looks and types of sporters and cut-down Krags.  I have many different ones in my collection now and have bought and sold quite a few over the years.
Your gun here, while probably a good shooter and a solid hunting rifle, is not a lot more than that.  With the 03 type front sight, the pistol grip added in and nothing special about the cut of the fore-end, I would not pay the above-mentioned prices for it.  In my opinion, I would say that this Krag would sit more comfortably in the $150-$200 range.
As with any gun, what you can get for it quite often depends on who is looking for what at the time, how much they want one and how much extra cash they have at the time.

Best regards,
Tom