Axial engines from what I understand arent worth a flip anyway from a lot of things I've read so even if it was in decent condition which is suspect IMO I still wouldnt value the engine very highly.
It definitely isnt worth 1100 bucks. Hell thats what you can build a new one for or close to it. I think the kit is $700 NIB You can get a good engine for it for lets say $250, servo $80 - $100 bucks, You can get parted out Losi bump boxes off of ebay brand new for $60 or so, Radio can very greatly but a lot of people already have their own radios anyway half the time.
I dont find myself buying used kits anymore or even trading for them very often because most people dont take as good of care of their kits as I do and they tend to think they are worth every penny they have put into them even though theyve put 2 years of wear and tear on them and and driven $500 dollars worth of parts off of them. Unless the skid plate looks like its in very very low use condition I wont even look at em twice anymore.