There does come the argument that when you buy a second hand car you don't know the condition of the tyres.
Personally, I'd have tyres off a car of which I know WHY the tyres are up for grabs. I know a tyre place that pulls them off damaged rims and sells them. IMO that's downright dangerous. One that has been off an MOT failure that failed on rust or something wouldn't bother me that much.
To be honest though, brakes, tyres and suspension I personally just buy new. You know what's what and you also have decent new parts providing you've gone midrange.
For example, Pagid pads are a minimum for me, a customer commented how much better the brakes are after taking out some cheap sh!te pads while doing other work and replacing them with Pagid on a 4.2l Supercharged Range Rover.
Just spend a bit less and go for new midrange tyres IMO.