Value on these is subjective, and will cause much dissention amongst the ranks of Jem lovers. *As proven time and time again through past eBay auctions, these will sell in the ball park of $900(ex condition)-1,500 (mint condition.) *Most that have been selling lately have not met a reserve price because people are over rating the value of the guitar.
Don't slam me because I feel this way - I think the LNG guitars should be worth more than the Jem 10th ($2500), just because it was the "maiden voyage" of the Jem series.
The value is up to you, but from a collector's view point the guitar has significantly lost value. *Non-original equipment, modification to the body, absence of signature all lead to the guitar's lackluster collector desirability. *(is that a word?!)
After reading the description of the item (player's guitar, worn fingerboard, damage to the finish, mods to the body etc.), I would not recommend paying over $900 for the guitar. *I would not recommend buying it as a collector's piece - it's a player. *
If a maple fingerboard is all you are interested in, you'd be better off buying a DY, SK, BFP or PMC (good luck finding the latter!) *You would get a much better deal, probably under a grand and in better condition.