... this is the only POS out of the 45+ spydercos that WERE in my collection... again, I'm not bitching because I got a lemon, I'm bitchin because CS will not do anything about it.
One POS out of 45+ and you got rid of all the good ones ... this is known by the technical expression "cutting off your nose to spite your face".
You also misunderstood the nature of the excellent customer service Spyderco provides routinely. It's not that you didn't get treted well, it's that most others get treated better than well.
Under many circumstances, Spyderco fixes knives that have outlived their service life, but because they can, they rejuvenate them. If they can't, that's mortality for you.
As tomcrx quoted, "If unable to improve the condition of the knife, we will return it to you with the recommendation it be retired from use. All costs associated with shipment of the product(s) are the responsibility of the customer."
When you buy a retail, production item, you buy it with a lifespan. Materials wear out. Warranties replace defects out of the factory. After use, it's on the owner.
By the way, spine-whacking linerlocks is a complicated and controversial procedure. Some say it's even a good idea to gently spine-whack a new linerlock to get it to "set" properly. How hard you hit it also factors in, and that's hard to describe in words.
I do check the fit of a new one by tapping it gently -- if it can't take that, there's a problem. Sometimes a hard opening can counter that, or lubing the tang/lockface junction, to get it to move over enough to keep from slipping off.