Most fishing lures catch more fishermen than they will ever catch fish. I think the same goes for rifles.
Guys buy or build rifles that they think at the time will be just awesome. When they get it they are impressed with it for a while and one day realize it has some undesirable feature. My informal observation is 3 popular shortcomings.
1) Short barrel
2) Large caliber such as 300 win mag
3) No adjustable cheek piece.
The owner then realizes that he can just sell the rifle to some other naive guy and get most of his money out so he can put the cash toward what he now knows he should have bought in the first place.
I see this with Sako TRGs, you will almost never see one for sale in 308 but there is always a 300 win mag for sale. Reason being, nobody likes to shoot a 300 win mag because it’s loud, expensive to shoot and it hurts.
Same deal when out house hunting. When you find a nice neighborhood there is never a house for sale. When you find a neighborhood with many homes for sale, there is always something wrong with living in the area.
So when you see a rifle for sale, ask yourself why and the answer is often quite clear.