sorry, i dont feel that a rifle thats been converted to something and does so with good quality would be worth less than normal rifle. A rifle not for historical value, but for accuracy and modern target firing is worth that or more if it comes with a scope/mount and other modifications. now if these are cheapo equipment i can understand, but with some of the expensive equipment out for mosins, i can understand a price of 100-500, thats reasonable, now i wouldnt buy a mosin for 500, id buy a decent savage, ruger or something .now, IF you are looking for rifles of that variety and class its understandable, while a authentic mosin for historic value can run 75 - 170, and can be a good point to modify to a sporter .
but these are completely different category's and should be treated as such IMO