I own an IT company that sells network/computer gear as part of our service. I buy direct from manufacturers in most cases and as the end seller of these products, I deal with the warranties. I just bought a $700 cast manifold for my skid steer. Showed up cracked. Called the company I purchased it from and another is on the way, no charge for the part or shipping.
So while things vary, I take your point. Anything manufacturers can do to slow/stop/avoid warranty issues benefits them. They know not everyone files a warranty claim.
If I'm not willing to stand behind a product, I won't sell it. As a buyer, I'd rather pay more to eliminate the hassle. My customers feel the same. One stop shopping. Keep folks coming back.