Sounds like you know bikes if you know what parts go for but a tip for anyone out there who doesn't know bikes well. If you happen to just check CL just to get an idea of prices motorcycles are on of those things everyone WAY overprices and winds up comming WAY down on it.
I know its the same to an extent with cars and everything but very much so with bikes. It's almost like people price a bike a grand higher than they expect to get and when your taking about a bike that's normally worth 3k-7k a grand is a pretty hefty chunk percentage wise. Not sure why its that way just th way it is. I used to buy and sell bikes, mostly older goldwings and honda cb750's but also some newer stuff and a few sport bikes.
Another thing, if you don't know how to work on bikes be prepared to spend a fortune to get one running. Most shops around me charge like $350 for a spring tuneup/oil change which essentially isn't much more than an oil change and making sure your chain is tight if you have a chain driven bike or the shaft dive oil change if you got a shaft drive.
Prett much best case scenario you got a running bike but no title and no key. Your probably looking at some minor work getting the carbs cleaned at very best case scenario so ther's some money gone. New ignition ther's a few hundred more nad plates and retitling probably a few hundred more. When you figure your probably sitting on a bike worth 4k most likely it cuts into your profits.
I've tried to get a few bikes at auctions for myself to ride not even to flip and its not even good prices for that. I think lots of people who don't knwo bikes just see a bike and say hey big ticket item and figure they can make a good buck nomatter what price they get in at, not the case at all.
One other thing to consider. Depending upon what region you in if your in an area that has a real winter plan on getting 15-20 percent less if you sell now vs waiting until next may.