Not going to disagree that you can get $400 for a fully equipped Mathews Outback bow on eBay. But this thread isn't on resale value but on depereciation.
Now I've been looking at getting a Mathews bow just about every year for the last 10 years since one of my friends has been shooting one. I've NEVER seen a brand new Mathews bow fully tricked out for $400; let alone the for the raw cost of the bow.
The only thing I've seen for $400 when it comes to butying new Mathews Bows are the add-on's you have to buy after paying $600-800 for just the bare bow (rest, quiver, stablizer, arrows, etc...).
Casey W. Roe
Remember the "Q" in QDM means Quality...not Quantity.